In which the pressure is balanced by a column of liquid. It is often used as a liquid because it has a very high density (≈13,600 kg/m³) and low pressure saturated steam at room temperature.
Atmospheric pressure at sea level is approximately 760 mmHg. Art. Standard atmospheric pressure is taken to be (exactly) 760 mmHg. Art. , or 101,325 Pa, hence the definition of a millimeter of mercury (101,325/760 Pa). Previously, a slightly different definition was used: the pressure of a column of mercury with a height of 1 mm and a density of 13.5951·10 3 kg/m³ with a free fall acceleration of 9.806 65 m/s². The difference between these two definitions is 0.000014%.
Millimeters of mercury are used, for example, in vacuum technology, in weather reports and in measuring blood pressure. Since in vacuum technology very often pressure is measured simply in millimeters, omitting the words “mercury column”, the natural transition for vacuum engineers to microns (microns) is carried out, as a rule, also without indicating “mercury column pressure”. Accordingly, when a pressure of 25 microns is indicated on a vacuum pump, we are talking about the maximum vacuum created by this pump, measured in microns of mercury. Of course, no one uses a Torricelli pressure gauge to measure such low pressures. To measure low pressures, other instruments are used, for example, McLeod pressure gauge (vacuum gauge).
Sometimes millimeters of water column are used ( 1 mmHg Art. = 13,5951 mm water Art. ). In the USA and Canada, the unit of measurement “inch of mercury” (designation - inHg) is also used. 1 inHg = 3,386389 kPa at 0 °C.
| Pascal (Pa, Pa) |
Bar (bar, bar) |
Technical atmosphere (at, at) |
Physical atmosphere (atm, atm) |
Millimeter of mercury (mm Hg, mmHg, Torr, torr) |
Water column meter (m water column, m H 2 O) |
Pound-force per sq. inch (psi) |
|
|---|---|---|---|---|---|---|---|
| 1 Pa | 1 / 2 | 10 −5 | 10.197 10 −6 | 9.8692 10 −6 | 7.5006 10 −3 | 1.0197 10 −4 | 145.04 10 −6 |
| 1 bar | 10 5 | 1 10 6 din / cm 2 | 1,0197 | 0,98692 | 750,06 | 10,197 | 14,504 |
| 1 at | 98066,5 | 0,980665 | 1 kgf/cm 2 | 0,96784 | 735,56 | 10 | 14,223 |
| 1 atm | 101325 | 1,01325 | 1,033 | 1 atm | 760 | 10,33 | 14,696 |
| 1 mmHg | 133,322 | 1.3332·10 −3 | 1.3595 10 −3 | 1.3158 10 −3 | 1 mmHg. | 13.595 10 −3 | 19.337 10 −3 |
| 1 m water Art. | 9806,65 | 9.80665 10 −2 | 0,1 | 0,096784 | 73,556 | 1 m water Art. | 1,4223 |
| 1 psi | 6894,76 | 68.948 10 −3 | 70.307 10 −3 | 68.046 10 −3 | 51,715 | 0,70307 | 1 lbf/in 2 |
see also
Wikimedia Foundation. 2010.
- Rodchenko, Alexander Mikhailovich
- Shaikhet, Arkady Samoilovich
See what “Millimeter of mercury” is in other dictionaries:
- (mm Hg, mm Hg), non-system units. pressure; 1 mmHg art. = 133.332 Pa = 1.35952 10 3 kgf/cm2 = 13.595 mm water. Art. Physical encyclopedic dictionary. M.: Soviet encyclopedia. Editor-in-chief A. M. Prokhorov. 1983. MILLIME... Physical encyclopedia
Non-system units pressure, app. when measuring atm. water vapor pressure, high vacuum, etc. Designation: Russian. - mmHg art., int. — mm Hg. 1 mmHg Art. equal to hydrostatic pressure of a column of mercury with a height of 1 mm and a density of 13.5951... ... Technical Translator's Guide
- – non-system units. pressure; 1 mmHg art. = 133.332 Pa = 1.35952 10 3 kgf/cm2 = 13.595 mm water. Art. [Physical encyclopedia. In 5 volumes. M.: Soviet Encyclopedia. Editor-in-chief A. M. Prokhorov. 1988.] Term heading: General terms… … Encyclopedia of terms, definitions and explanations of building materials
Off-system unit of pressure; designation: mmHg Art. 1 mmHg Art. = 133.322 Pa = 13.5951 mm water column. * * * MILLIMETER OF MERCURY COLUMN MILLIMETER OF MERCURY, non-systemic unit of pressure; designation: mmHg Art. 1 mmHg Art. = 133.322... encyclopedic Dictionary
Torr, an off-system unit of pressure used when measuring atmospheric pressure of water vapor, high vacuum, etc. Designation: Russian mm Hg. Art., international mm Hg. 1 mm of mercury is equal to hydrostatic... Encyclopedic Dictionary of Metallurgy
- (mmHg) unit of pressure, as a result of which mercury in the column rises by 1 millimeter. 1 mmHg Art. = 133.3224 Pa... Dictionary in medicine
Torr, a non-systemic unit of pressure used in measurements of atmospheric pressure, partial pressure of water vapor, high vacuum, etc. Designations: Russian mm Hg. Art., international mm Hg. 1 mmHg see equal... ... Great Soviet Encyclopedia
Non-system units not subject to use. pressure. Designation mm Hg. Art. 1 mmHg Art. = 133.322 Pa (see Pascal) ... Big Encyclopedic Polytechnic Dictionary
Off-system unit of pressure; designation: mmHg Art. 1 mmHg Art. = 133.322 Pa = 13.5951 mm water. st... Natural science. encyclopedic Dictionary
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1 millimeter of mercury (0°C) [mmHg] = 0.0013595060494664 technical atmosphere [at]
Initial value
Converted value
pascal exapascal petapascal terapascal gigapascal megapascal kilopascal hectopascal decapascal decipascal centipascal millipascal micropascal nanopascal picopascal femtopascal attopascal newton per square meter meter newton per square meter centimeter newton per square meter millimeter kilonewton per square meter meter bar millibar microbar dyne per sq. centimeter kilogram-force per square meter. meter kilogram-force per square meter centimeter kilogram-force per square meter. millimeter gram-force per square meter centimeter ton-force (kor.) per sq. ft ton-force (kor.) per sq. inch ton-force (long) per sq. ft ton-force (long) per sq. inch kilopound-force per sq. inch kilopound-force per sq. inch lbf per sq. ft lbf per sq. inch psi poundal per sq. foot torr centimeter of mercury (0°C) millimeter of mercury (0°C) inch of mercury (32°F) inch of mercury (60°F) centimeter of water. column (4°C) mm water. column (4°C) inch water. column (4°C) foot of water (4°C) inch of water (60°F) foot of water (60°F) technical atmosphere physical atmosphere decibar walls on square meter barium pieze (barium) Planck pressure meter of sea water foot of sea water (at 15°C) meter of water. column (4°C)
Thermal resistance
More about pressure
General information
In physics, pressure is defined as the force acting on a unit surface area. If two equal forces act on one larger and one smaller surface, then the pressure on the smaller surface will be greater. Agree, it is much worse if someone who wears stilettos steps on your foot than someone who wears sneakers. For example, if you press the blade of a sharp knife onto a tomato or carrot, the vegetable will be cut in half. The surface area of the blade in contact with the vegetable is small, so the pressure is high enough to cut that vegetable. If you press with the same force on a tomato or carrot with a dull knife, then most likely the vegetable will not be cut, since the surface area of the knife is now larger, which means the pressure is less.
In the SI system, pressure is measured in pascals, or newtons per square meter.
Relative pressure
Sometimes pressure is measured as the difference between absolute and atmospheric pressure. This pressure is called relative or gauge pressure and is what is measured, for example, when checking the pressure in car tires. Measuring instruments often, although not always, indicate relative pressure.
Atmosphere pressure
Atmospheric pressure is the pressure of air in this place. It usually refers to the pressure of a column of air per unit surface area. Changes in atmospheric pressure affect weather and air temperature. People and animals suffer from severe pressure changes. Low blood pressure causes problems of varying severity in humans and animals, from mental and physical discomfort to fatal diseases. For this reason, aircraft cabins are maintained above atmospheric pressure at a given altitude because the atmospheric pressure at cruising altitude is too low.
Atmospheric pressure decreases with altitude. People and animals living high in the mountains, such as the Himalayas, adapt to such conditions. Travelers, on the other hand, should take the necessary precautions to avoid getting sick due to the fact that the body is not used to such low pressure. Climbers, for example, can suffer from altitude sickness, which is associated with a lack of oxygen in the blood and oxygen starvation of the body. This disease is especially dangerous if you stay in the mountains for a long time. Exacerbation of altitude sickness leads to serious complications such as acute mountain sickness, high altitude pulmonary edema, high altitude cerebral edema and extreme mountain sickness. The danger of altitude and mountain sickness begins at an altitude of 2400 meters above sea level. To avoid altitude sickness, doctors advise not to use depressants such as alcohol and sleeping pills, drink plenty of fluids, and rise to altitude gradually, for example, on foot rather than by transport. It's also good to eat a large number of carbohydrates, and rest well, especially if the uphill climb happened quickly. These measures will allow the body to get used to the oxygen deficiency caused by low atmospheric pressure. If you follow these recommendations, your body will be able to produce more red blood cells to transport oxygen to the brain and internal organs. To do this, the body will increase the pulse and breathing rate.
First medical aid in such cases is provided immediately. It is important to move the patient to a lower altitude where the atmospheric pressure is higher, preferably to an altitude lower than 2400 meters above sea level. Medicines and portable hyperbaric chambers are also used. These are lightweight, portable chambers that can be pressurized using a foot pump. A patient with altitude sickness is placed in a chamber in which the pressure corresponding to a lower altitude is maintained. This camera is used only for first aid medical care, after which the patient must be lowered lower.
Some athletes use low pressure to improve circulation. Typically, this requires training to take place under normal conditions, and these athletes sleep in a low-pressure environment. Thus, their body gets used to high altitude conditions and begins to produce more red blood cells, which, in turn, increases the amount of oxygen in the blood, and allows them to achieve better results in sports. For this purpose, special tents are produced, the pressure in which is regulated. Some athletes even change the pressure in the entire bedroom, but sealing the bedroom is an expensive process.
Spacesuits
Pilots and astronauts have to work in low pressure environments, so they wear pressure suits to compensate for the low pressure. environment. Space suits completely protect a person from the environment. They are used in space. Altitude-compensation suits are used by pilots at high altitudes - they help the pilot breathe and counteract low barometric pressure.
Hydrostatic pressure
Hydrostatic pressure is the pressure of a fluid caused by gravity. This phenomenon plays a huge role not only in technology and physics, but also in medicine. For example, blood pressure is the hydrostatic pressure of blood on the walls of blood vessels. Blood pressure is the pressure in the arteries. It is represented by two values: systolic, or the highest pressure, and diastolic, or the lowest pressure during a heartbeat. Measuring instruments blood pressure called sphygmomanometers or tonometers. The unit of blood pressure is millimeters of mercury.
The Pythagorean mug is an interesting vessel that uses hydrostatic pressure, and specifically the siphon principle. According to legend, Pythagoras invented this cup to control the amount of wine he drank. According to other sources, this cup was supposed to control the amount of water drunk during a drought. Inside the mug there is a curved U-shaped tube hidden under the dome. One end of the tube is longer and ends in a hole in the stem of the mug. The other, shorter end is connected by a hole to the inside bottom of the mug so that the water in the cup fills the tube. The principle of operation of the mug is similar to the operation of a modern toilet cistern. If the liquid level becomes higher than the level of the tube, the liquid flows into the second half of the tube and flows out, thanks to hydrostatic pressure. If the level, on the contrary, is lower, then you can safely use the mug.
Pressure in geology
Pressure is an important concept in geology. Without pressure, the formation of gemstones, both natural and artificial, is impossible. High pressure and high temperature are also necessary for the formation of oil from the remains of plants and animals. Unlike gems, which primarily form in rocks, oil forms at the bottom of rivers, lakes, or seas. Over time, more and more sand accumulates over these remains. The weight of water and sand presses on the remains of animal and plant organisms. Over time, this organic material sinks deeper and deeper into the earth, reaching several kilometers below the earth's surface. The temperature increases by 25 °C for every kilometer below the earth's surface, so at a depth of several kilometers the temperature reaches 50–80 °C. Depending on the temperature and temperature difference in the formation environment, natural gas may form instead of oil.
Natural gemstones
The formation of gemstones is not always the same, but pressure is one of the main components this process. For example, diamonds are formed in the Earth's mantle, under conditions of high pressure and high temperature. During volcanic eruptions, diamonds move to the upper layers of the Earth's surface thanks to magma. Some diamonds fall to Earth from meteorites, and scientists believe they formed on planets similar to Earth.
Synthetic gemstones
The production of synthetic gemstones began in the 1950s and has been gaining popularity recently. Some buyers prefer natural gemstones, but artificial stones are becoming more and more popular due to the low price and lack of problems associated with the extraction of natural gemstones. Thus, many buyers choose synthetic gemstones because their extraction and sale is not associated with human rights violations, child labor and the financing of wars and armed conflicts.
One of the technologies for growing diamonds in laboratory conditions is the method of growing crystals at high pressure and high temperature. In special devices, carbon is heated to 1000 °C and subjected to pressure of about 5 gigapascals. Typically, a small diamond is used as the seed crystal, and graphite is used for the carbon base. From it a new diamond grows. This is the most common method of growing diamonds, especially as gemstones, due to its low cost. The properties of diamonds grown in this way are the same or better than those of natural stones. The quality of synthetic diamonds depends on the method used to grow them. Compared to natural diamonds, which are often clear, most man-made diamonds are colored.
Due to their hardness, diamonds are widely used in manufacturing. In addition, their high thermal conductivity, optical properties and resistance to alkalis and acids are valued. Cutting tools often coated with diamond dust, which is also used in abrasives and materials. Most of the diamonds in production are of artificial origin due to the low price and because the demand for such diamonds exceeds the ability to mine them in nature.
Some companies offer services for creating memorial diamonds from the ashes of the deceased. To do this, after cremation, the ashes are refined until carbon is obtained, and then a diamond is grown from it. Manufacturers advertise these diamonds as mementos of the departed, and their services are popular, especially in countries with large percentages of wealthy citizens, such as the United States and Japan.
Method of growing crystals at high pressure and high temperature
The method of growing crystals under high pressure and high temperature is mainly used to synthesize diamonds, but recently this method has been used to improve natural diamonds or change their color. Various presses are used to artificially grow diamonds. The most expensive to maintain and the most complex of them is the cubic press. It is used primarily to enhance or change the color of natural diamonds. Diamonds grow in the press at a rate of approximately 0.5 carats per day.
Do you find it difficult to translate units of measurement from one language to another? Colleagues are ready to help you. Post a question in TCTerms and within a few minutes you will receive an answer.
Pascal (Pa, Pa)
Bar (bar, bar)- approximately equal to one atmosphere.
One bar is equal to 105 N/m² or 106 dynes/cm² or 0.986923 atm.
Also used millibar
PSI (lb.p.sq.in.)
millimeter of water column inch of mercury (inHg)
Micron (micron,μ )
| Pascal | Bar | Technical atmosphere | Physical atmosphere | Millimeter of mercury | Pound-force per square inch | Micron | Inch of mercury | |
|---|---|---|---|---|---|---|---|---|
| (Pa, Pa) | (bar, bar) | (at, at) | (atm, atm) | (mmHg, torr, torr) | (psi) | (μκ, micron) | ("Hg, inHg) | |
| 1 Pa | 1 N m2 | 10-5 | 10.197 10-6 | 9.8692 10-6 | 7.5006 10-6 | 145.04 10-6 | 7,5 | 29.53 10-5 |
| 1 bar | 105 | 1·106 dynes/cm2 | 1,0197 | 0,98692 | 750,06 | 14,504 | 7.5 105 | 2,953 |
| 1 at | 98066,5 | 0,980665 | 1 kgf/cm2 | 0,96784 | 735,56 | 14,223 | 7.356 105 | 28,96 |
| 1 atm | 101325 | 1,01325 | 1,033 | 1 atm | 760 | 14,696 | 7.6 105 | 29,9222 |
| 1 mmHg | 133,322 | 1.3332·10-3 | 1.3595 10-3 | 1.3158 10-3 | 1 mmHg | 19.337 10-3 | 1000 | 39.37 10-3 |
| 1 psi | 6894,76 | 68.948 10-3 | 70.307 10-3 | 68.046 10-3 | 51,715 | 1 lbf/in2 | 5.171 104 | 0,2036 |
| 1 micron | 0,1333 | 1.333 10-6 | 1.3595 10-6 | 1.3158 10-6 | 10-3 | 19.337 10-6 | 1 μκ | 39.37 10-6 |
| 1"Hg | 3.386 103 | 0,33864 | 34.531 10-3 | 33.42 10-3 | 25,4 | 4,9116 | 25.4·103 | 1 inHg |
Alexey Matveev,
You will need
- - calculator;
- - computer;
- - Internet.
Instructions
- When converting pressure to pascals, keep in mind that when measuring blood pressure, in meteorological reports, as well as among vacuum engineers, the name “mmHg” is often abbreviated. Art." to “mm” (sometimes millimeters are also omitted). Therefore, if the pressure is specified in millimeters or just a number, then most likely it is mmHg. Art. (if possible, please clarify). When measuring very low pressures instead of mmHg. Art. "vacuum specialists" use the unit "micron of mercury", which is usually designated as "µm". Accordingly, if the pressure is indicated in microns, then simply divide this number by a thousand and get the pressure in mmHg. Art.
- When measuring high pressures The unit “atmosphere” is often used, corresponding to normal atmospheric pressure.
Millimeter of mercury
One atmosphere (atm) is equal to 760 mm Hg. Art. That is, to obtain pressure in mmHg. Art. multiply the number of atmospheres by 760. If the pressure is indicated in “technical atmospheres”, then to convert the pressure to mm Hg. Art. multiply this number by 735.56.
- Example.
505400 Pa (or 505.4 kPa).
CompleteRepair.Ru
When installing an air conditioner, it is necessary to measure the pressure in the system. Pressure gauges use different pressure units, which in turn may differ from those specified in technical specifications the air conditioner itself. How to avoid confusion in this diversity?
To help novice installers, below is short description different units of pressure measurement.
Pascal (Pa, Pa)- equal to a pressure force of one newton per square meter.
Bar (bar, bar)
Also used millibar(mbar, mbar), 1 mbar = 0.001 bar.
The atmosphere is technical (at, at)- equal to a pressure of 1 kgf per 1 cm².
The atmosphere is standard, physical (atm, atm)- equal to 101,325 Pa and 760 millimeters of mercury.
PSI (lb.p.sq.in.)- pound-force per square inch, lbf/in² is equal to 6,894.75729 Pa.
Millimeter of mercury (mm Hg, mm Hg, torr, Torr)— equal to 133.3223684 Pa. Also used millimeter of water column(1 mmHg = 13.5951 mmH2O) and inch of mercury (inHg).
Millimeter of mercury to pascal
1 inHg = 3.386389 kPa at 0°C.
Micron (micron,μ ) - equal to 0.001 mm Hg. Art. (0.001 Torr).
Conversion table for pressure units:
| Pascal | Bar | Technical atmosphere | Physical atmosphere | Millimeter of mercury | Pound-force per square inch | Micron | Inch of mercury | |
|---|---|---|---|---|---|---|---|---|
| (Pa, Pa) | (bar, bar) | (at, at) | (atm, atm) | (mmHg, torr, torr) | (psi) | (μκ, micron) | ("Hg, inHg) | |
| 1 Pa | 1 N m2 | 10-5 | 10.197 10-6 | 9.8692 10-6 | 7.5006 10-6 | 145.04 10-6 | 7,5 | 29.53 10-5 |
| 1 bar | 105 | 1·106 dynes/cm2 | 1,0197 | 0,98692 | 750,06 | 14,504 | 7.5 105 | 2,953 |
| 1 at | 98066,5 | 0,980665 | 1 kgf/cm2 | 0,96784 | 735,56 | 14,223 | 7.356 105 | 28,96 |
| 1 atm | 101325 | 1,01325 | 1,033 | 1 atm | 760 | 14,696 | 7.6 105 | 29,9222 |
| 1 mmHg | 133,322 | 1.3332·10-3 | 1.3595 10-3 | 1.3158 10-3 | 1 mmHg | 19.337 10-3 | 1000 | 39.37 10-3 |
| 1 psi | 6894,76 | 68.948 10-3 | 70.307 10-3 | 68.046 10-3 | 51,715 | 1 lbf/in2 | 5.171 104 | 0,2036 |
| 1 micron | 0,1333 | 1.333 10-6 | 1.3595 10-6 | 1.3158 10-6 | 10-3 | 19.337 10-6 | 1 μκ | 39.37 10-6 |
| 1"Hg | 3.386 103 | 0,33864 | 34.531 10-3 | 33.42 10-3 | 25,4 | 4,9116 | 25.4·103 | 1 inHg |
Alexey Matveev,
technical specialist at Raskhodka company
In order to find out how many atmospheres there are in a millimeter of mercury, you need to use a simple online calculator. Enter in the left field the number of millimeters of mercury that you want to convert. In the field on the right you will see the result of the calculation. If you need to convert millimeters of mercury or atmosphere to other units of measurement, simply click on the appropriate link.
What is a "millimeter of mercury"
The off-system unit millimeter of mercury (mm Hg; mm Hg), sometimes called "torr", is equal to 101 325 / 760 ≈ 133.322 368 4 Pa. Atmospheric pressure was measured with a barometer containing a column of mercury, hence the name of this unit of measurement. At sea level, the atmospheric pressure is approximately 760 mmHg. Art. or 101,325 Pa, hence the value is 101,325/760 Pa. This unit is traditionally used in vacuum technology, in measuring blood pressure and in weather reports. In some instruments, measurements are made in millimeters of water column (1 mm Hg = 13.5951 mm water column), and in the USA and Canada there is also an “inch of mercury” (inHg) = 3.386389 kPa at 0° C.
What is "atmosphere"
An off-system unit of pressure that approximates atmospheric pressure at ocean level. There are equally two units - the technical atmosphere (at, at) and the normal, standard or physical atmosphere (atm, atm). One technical atmosphere is a uniform perpendicular pressure of a force of 1 kgf on a flat surface with an area of 1 cm². 1 at = 98,066.5 Pa.
Pressure Calculator
The standard atmosphere is a pressure of a mercury column with a height of 760 mm at a mercury density of 13,595.04 kg/m³ and zero temperature. 1 atm = 101,325 Pa = 1.033233 at. In the Russian Federation, only the technical atmosphere is used.
In the past, the terms "ata" and "ati" were used for absolute and gauge pressure. Excess pressure is the difference between absolute and atmospheric pressure, when absolute pressure is greater than atmospheric pressure. The difference between atmospheric and absolute pressure when absolute pressure below atmospheric pressure is called rarefaction (vacuum).
Millimeters of mercury and pascals are used to measure pressure. Although the pascal is an official system unit, non-system millimeters of mercury are in no way inferior to them in their prevalence. “Millimeters” even have their own name – “torr”, given in honor of the famous scientist Torricelli. There is an exact relationship between the two units: 1 mm Hg. Art. = 101325 / 760 Pa, which is the definition of the unit “mm Hg.” Art."
You will need
- - calculator;
- - computer;
- - Internet.
Instructions
- To convert the pressure specified in millimeters of mercury to pascals, multiply the number of mmHg. Art. by the number 101325, and then divide by 760. That is, use a simple formula: Kp = Km * 101325 / 760, where:
Km – pressure in millimeters of mercury (mm Hg, mm Hg, torr, torr)
Kp – pressure in pascals (Pa, Pa). - Using the above formula gives the closest match between the two measurement systems. For practical calculations, use a simpler formula: Kp = Km * 133.322 or simplified Kp = Km * 133.
- When converting pressure to pascals, keep in mind that when measuring blood pressure, in meteorological reports, as well as among vacuum engineers, the name “mmHg” is often abbreviated. Art." to “mm” (sometimes millimeters are also omitted). Therefore, if the pressure is specified in millimeters or just a number, then most likely it is mmHg. Art. (if possible, please clarify).
How to convert Pa to mm. rt. Art.?
When measuring very low pressures instead of mmHg. Art. "vacuum specialists" use the unit "micron of mercury", which is usually designated as "µm". Accordingly, if the pressure is indicated in microns, then simply divide this number by a thousand and get the pressure in mmHg. Art.
- When measuring high pressures, the unit “atmosphere” is often used, corresponding to normal atmospheric pressure. One atmosphere (atm) is equal to 760 mm Hg. Art. That is, to obtain pressure in mmHg. Art. multiply the number of atmospheres by 760. If the pressure is indicated in “technical atmospheres”, then to convert the pressure to mm Hg. Art. multiply this number by 735.56.
- Example.
The pressure in a car tire is 5 atmospheres. What will this pressure be equal to, expressed in pascals? Solution.
Convert pressure from atmospheres to mmHg. Art.: 5 * 760 = 3800.
Convert pressure from mm Hg. Art. in pascals: 3800 * 133 = 505400. Answer.
505400 Pa (or 505.4 kPa). - If you have a computer or mobile phone with Internet access, then simply find any online service for converting physical units of measurement. To do this, type in a search engine a phrase like “convert from mmHg to pascals” and use the instructions on the service website.
CompleteRepair.Ru
Converting pascals to millimeters of mercury
When installing an air conditioner, it is necessary to measure the pressure in the system. Pressure gauges use different pressure units, which, in turn, may differ from those indicated in the technical specifications of the air conditioner itself. How to avoid confusion in this diversity?
To help novice installers, a brief description of the different pressure units is provided below.
Pascal (Pa, Pa)- equal to a pressure force of one newton per square meter.
Bar (bar, bar)- approximately equal to one atmosphere. One bar is equal to 105 N/m² or 106 dynes/cm² or 0.986923 atm.
Also used millibar(mbar, mbar), 1 mbar = 0.001 bar.
The atmosphere is technical (at, at)- equal to a pressure of 1 kgf per 1 cm².
The atmosphere is standard, physical (atm, atm)- equal to 101,325 Pa and 760 millimeters of mercury.
PSI (lb.p.sq.in.)- pound-force per square inch, lbf/in² is equal to 6,894.75729 Pa.
Millimeter of mercury (mm Hg, mm Hg, torr, Torr)— equal to 133.3223684 Pa. Also used millimeter of water column(1 mmHg = 13.5951 mmH2O) and inch of mercury (inHg). 1 inHg = 3.386389 kPa at 0°C.
Micron (micron,μ ) - equal to 0.001 mm Hg. Art. (0.001 Torr).
Conversion table for pressure units:
| Pascal | Bar | Technical atmosphere | Physical atmosphere | Millimeter of mercury | Pound-force per square inch | Micron | Inch of mercury | |
|---|---|---|---|---|---|---|---|---|
| (Pa, Pa) | (bar, bar) | (at, at) | (atm, atm) | (mmHg, torr, torr) | (psi) | (μκ, micron) | ("Hg, inHg) | |
| 1 Pa | 1 N m2 | 10-5 | 10.197 10-6 | 9.8692 10-6 | 7.5006 10-6 | 145.04 10-6 | 7,5 | 29.53 10-5 |
| 1 bar | 105 | 1·106 dynes/cm2 | 1,0197 | 0,98692 | 750,06 | 14,504 | 7.5 105 | 2,953 |
| 1 at | 98066,5 | 0,980665 | 1 kgf/cm2 | 0,96784 | 735,56 | 14,223 | 7.356 105 | 28,96 |
| 1 atm | 101325 | 1,01325 | 1,033 | 1 atm | 760 | 14,696 | 7.6 105 | 29,9222 |
| 1 mmHg | 133,322 | 1.3332·10-3 | 1.3595 10-3 | 1.3158 10-3 | 1 mmHg | 19.337 10-3 | 1000 | 39.37 10-3 |
| 1 psi | 6894,76 | 68.948 10-3 | 70.307 10-3 | 68.046 10-3 | 51,715 | 1 lbf/in2 | 5.171 104 | 0,2036 |
| 1 micron | 0,1333 | 1.333 10-6 | 1.3595 10-6 | 1.3158 10-6 | 10-3 | 19.337 10-6 | 1 μκ | 39.37 10-6 |
| 1"Hg | 3.386 103 | 0,33864 | 34.531 10-3 | 33.42 10-3 | 25,4 | 4,9116 | 25.4·103 | 1 inHg |
Alexey Matveev,
technical specialist at Raskhodka company
- The unit of measurement of pressure in SI is pascal (Russian designation: Pa; international: Pa) = N/m 2
- Conversion table for pressure measurement units. Pa; MPa; bar; atm; mmHg.; mm H.S.; m w.st., kg/cm 2 ; psf; psi; inches Hg; inches in.st. below
- Note, there are 2 tables and a list. Here's another useful link:
| In units: | ||||||||
| Pa (N/m2) | MPa | bar | atmosphere | mmHg Art. | mm in.st. | m in.st. | kgf/cm 2 | |
| Should be multiplied by: | ||||||||
| Pa (N/m2) - pascal, SI unit of pressure | 1 | 1*10 -6 | 10 -5 | 9.87*10 -6 | 0.0075 | 0.1 | 10 -4 | 1.02*10 -5 |
| MPa, megapascal | 1*10 6 | 1 | 10 | 9.87 | 7.5*10 3 | 10 5 | 10 2 | 10.2 |
| bar | 10 5 | 10 -1 | 1 | 0.987 | 750 | 1.0197*10 4 | 10.197 | 1.0197 |
| atm, atmosphere | 1.01*10 5 | 1.01* 10 -1 | 1.013 | 1 | 759.9 | 10332 | 10.332 | 1.03 |
| mmHg Art., mm of mercury | 133.3 | 133.3*10 -6 | 1.33*10 -3 | 1.32*10 -3 | 1 | 13.3 | 0.013 | 1.36*10 -3 |
| mm w.c., mm water column | 10 | 10 -5 | 0.000097 | 9.87*10 -5 | 0.075 | 1 | 0.001 | 1.02*10 -4 |
| m w.st., meter of water column | 10 4 | 10 -2 | 0.097 | 9.87*10 -2 | 75 | 1000 | 1 | 0.102 |
| kgf/cm 2, kilogram-force per square centimeter | 9.8*10 4 | 9.8*10 -2 | 0.98 | 0.97 | 735 | 10000 | 10 | 1 |
| 47.8 | 4.78*10 -5 | 4.78*10 -4 | 4.72*10 -4 | 0.36 | 4.78 | 4.78 10 -3 | 4.88*10 -4 | |
| 6894.76 | 6.89476*10 -3 | 0.069 | 0.068 | 51.7 | 689.7 | 0.690 | 0.07 | |
| Inches Hg / inches Hg | 3377 | 3.377*10 -3 | 0.0338 | 0.033 | 25.33 | 337.7 | 0.337 | 0.034 |
| Inches in.st. / inchesH2O | 248.8 | 2.488*10 -2 | 2.49*10 -3 | 2.46*10 -3 | 1.87 | 24.88 | 0.0249 | 0.0025 |
| To convert pressure in units: | In units: | |||
| psi pound square feet (psf) | psi inch / pound square inches (psi) | Inches Hg / inches Hg | Inches in.st. / inchesH2O | |
| Should be multiplied by: | ||||
| Pa (N/m 2) - SI unit of pressure | 0.021 | 1.450326*10 -4 | 2.96*10 -4 | 4.02*10 -3 |
| MPa | 2.1*10 4 | 1.450326*10 2 | 2.96*10 2 | 4.02*10 3 |
| bar | 2090 | 14.50 | 29.61 | 402 |
| atm | 2117.5 | 14.69 | 29.92 | 407 |
| mmHg Art. | 2.79 | 0.019 | 0.039 | 0.54 |
| mm in.st. | 0.209 | 1.45*10 -3 | 2.96*10 -3 | 0.04 |
| m in.st. | 209 | 1.45 | 2.96 | 40.2 |
| kgf/cm 2 | 2049 | 14.21 | 29.03 | 394 |
| psi pound square feet (psf) | 1 | 0.0069 | 0.014 | 0.19 |
| psi inch / pound square inches (psi) | 144 | 1 | 2.04 | 27.7 |
| Inches Hg / inches Hg | 70.6 | 0.49 | 1 | 13.57 |
| Inches in.st. / inchesH2O | 5.2 | 0.036 | 0.074 | 1 |
Detailed list of pressure units, one pascal is:
- 1 Pa (N/m 2) = 0.0000102 Atmosphere (metric)
- 1 Pa (N/m2) = 0.0000099 Atmosphere (standard) = Standard atmosphere
- 1 Pa (N/m2) = 0.00001 Bar / Bar
- 1 Pa (N/m 2) = 10 Barad / Barad
- 1 Pa (N/m2) = 0.0007501 Centimeters Hg. Art. (0°C)
- 1 Pa (N/m2) = 0.0101974 Centimeters in. Art. (4°C)
- 1 Pa (N/m2) = 10 Dyne/square centimeter
- 1 Pa (N/m2) = 0.0003346 Foot of water (4 °C)
- 1 Pa (N/m2) = 10 -9 Gigapascals
- 1 Pa (N/m2) = 0.01
- 1 Pa (N/m2) = 0.0002953 Dumov Hg. / Inch of mercury (0 °C)
- 1 Pa (N/m2) = 0.0002961 InchHg. Art. / Inch of mercury (15.56 °C)
- 1 Pa (N/m2) = 0.0040186 Dumov v.st. / Inch of water (15.56 °C)
- 1 Pa (N/m 2) = 0.0040147 Dumov v.st. / Inch of water (4 °C)
- 1 Pa (N/m 2) = 0.0000102 kgf/cm 2 / Kilogram force/centimetre 2
- 1 Pa (N/m 2) = 0.0010197 kgf/dm 2 / Kilogram force/decimetre 2
- 1 Pa (N/m2) = 0.101972 kgf/m2 / Kilogram force/meter 2
- 1 Pa (N/m 2) = 10 -7 kgf/mm 2 / Kilogram force/millimeter 2
- 1 Pa (N/m 2) = 10 -3 kPa
- 1 Pa (N/m2) = 10 -7 Kilopound force/square inch
- 1 Pa (N/m 2) = 10 -6 MPa
- 1 Pa (N/m2) = 0.000102 Meters w.st. / Meter of water (4 °C)
- 1 Pa (N/m2) = 10 Microbar / Microbar (barye, barrie)
- 1 Pa (N/m2) = 7.50062 Microns Hg. / Micron of mercury (millitorr)
- 1 Pa (N/m2) = 0.01 Millibar / Millibar
- 1 Pa (N/m2) = 0.0075006 (0 °C)
- 1 Pa (N/m2) = 0.10207 Millimeters w.st. / Millimeter of water (15.56 °C)
- 1 Pa (N/m2) = 0.10197 Millimeters w.st. / Millimeter of water (4 °C)
- 1 Pa (N/m 2) = 7.5006 Millitorr / Millitorr
- 1 Pa (N/m2) = 1N/m2 / Newton/square meter
- 1 Pa (N/m2) = 32.1507 Daily ounces/sq. inch / Ounce force (avdp)/square inch
- 1 Pa (N/m2) = 0.0208854 Pounds of force per square meter. ft / Pound force/square foot
- 1 Pa (N/m2) = 0.000145 Pounds of force per square meter. inch / Pound force/square inch
- 1 Pa (N/m2) = 0.671969 Poundals per sq. ft / Poundal/square foot
- 1 Pa (N/m2) = 0.0046665 Poundals per sq. inch / Poundal/square inch
- 1 Pa (N/m2) = 0.0000093 Long tons per square meter. ft / Ton (long)/foot 2
- 1 Pa (N/m2) = 10 -7 Long tons per square meter. inch / Ton (long)/inch 2
- 1 Pa (N/m2) = 0.0000104 Short tons per sq. ft / Ton (short)/foot 2
- 1 Pa (N/m2) = 10 -7 Tons per sq. inch / Ton/inch 2
- 1 Pa (N/m2) = 0.0075006 Torr / Torr
- pressure in pascals and atmospheres, convert pressure to pascals
- atmospheric pressure is equal to XXX mmHg. express it in pascals
- gas pressure units - translation
- fluid pressure units - translation
Pressure- This physical quantity, showing effective force per unit surface area perpendicular to that surface.
Pressure is defined as P = F / S, where P is pressure, F is pressure force, S is surface area. From this formula it is clear that pressure depends on the surface area of the body acting with a certain force. How smaller area surface, the greater the pressure.
The unit of pressure is newton per square meter (N/m2). We can also convert pressure units N/m2 to pascals, units named after the French scientist Blaise Pascal, who developed the so-called Pascal's Law. 1 N/m2 = 1 Pa.
What's happened???
Pressure of gases and liquids - manometer, differential pressure gauge, vacuum gauge, pressure sensor.
Atmospheric pressure - barometer.
Blood pressure - with a tonometer.
And so, once again the pressure is defined as P = F / S. The force in the gravitational field is equal to the weight - F = m * g, where m is the mass of the body; g – acceleration free fall. Then the pressure is
P = m * g / S. Using this formula, you can determine the pressure exerted by the body on the surface. For example, a person to the ground.
Atmospheric pressure decreases with altitude. The dependence of atmospheric pressure on altitude is determined by the barometric formula -
P = Po*exp(- μgh/RT). Where, μ = 0.029 kg/m3 – molecular weight of gas (air); g = 9.81 m/s2 – free fall acceleration; h — ho– difference in altitude above sea level and the accepted altitude at the beginning of the report (h=ho); R = 8.31 - J/mol K – gas constant; Po – atmospheric pressure at the height taken as the reference point; T - temperature in Kelvin.
It has been experimentally established that atmospheric pressure at sea level is approximately 760 mm Hg. Art. Standard atmospheric pressure is taken to be 760 mmHg. Art., or 101,325 Pa, hence the definition of a millimeter of mercury 101,325/760 Pa = 133.322,368, i.e. 1 mmHg Art. = 133.322 Pa.
Mercury mercury(Russian Mark: mmHg mmHg
St.; international: mmHg Art.) is a non-systematic pressure measurement unit equal to 101,325/760 ≈ 133.32,368 4 Pa; sometimes called "Thor"(Russian tag - torr, International - Torr) in honor of the evangelists Torricelli.
In the Russian Federation, it is allowed to use a millimeter of mercury as an outsourcing without limitation of the validity period of “medicine, meteorology, aviation”.
The International Organization of Legal Metrology (OIML) in its recommendation applies the millimeter of mercury to units of measurement "that may be provisionally used before the date specified in national regulations, but cannot be determined if they are not used."
The source of this device is connected to the barometer method of measuring atmospheric pressure, in which the pressure is regulated by a column of liquid. Liquid mercury is widely used because it has a very high density (≈13,600 kg/m3), which reduces the required liquid column height and low pressure steam at room temperature.
Atmospheric pressure at sea is about 760 mm Hg. Standard atmospheric pressure is assumed to be (exactly) 760 mm Hg. Art. Or 101,325 Pa, so the definition of a millimeter of mercury is assumed (101,325/760 Pa). Previously, a slightly different definition was used: the height of the mercury column is 1 mm and the density is 13.5951 x 103 kg / m³ acceleration free fall 9.806 65 m / s².
The difference between these two definitions is 0.000014%.
Pressure: a short history and units of measurement
Millimeters of mercury are used, for example, in vacuum technology, weather reporting and blood pressure measurements. Because the vacuum technology often represents pressure measured in millimeters, we simply omit the word "Hg" to physically convert to vacuum systems micrometers (microns), usually without "Hg" pressure.
When a vacuum pump reads 25 microns, this is the last vacuum produced by that pump, measured in column microns of mercury. Of course, no one uses a Torricelli meter to measure such low pressures.
To measure low pressure, use other tools such as a McLeod pressure gauge (vacuum gauge).
Sometimes millimeters of water are used (1 mmHg = 13,5951 mm of water.). The United States and Canada also use the "v" measurement unit. Hg" (inHg). 1 inches of mercury = 3386389 kPa at 0°C
| 1 N/m² | 10-5 | 10.197 10-6 | 9.8692 10-6 | 7,500 10-3 | 1.0197 10-4 | 145.04 10-6 |
| 105 | 1 106 dyne/cm² | 1,0197 | 0,98692 | 750,06 | 10197 | 14,504 |
| 98066,5 | 0.980665 | 1 kgf/cm² | 0,96784 | 735,56 | 10 | 14223 |
| 101325 | 1,01325 | 1033 | 1 atm | 760 | 10:33 | 14,696 |
| 133,322 | 1.3332 10-3 | 1.3595 10-3 | 1.3158 10-3 | 1 mmHg Art. | 13.595 10-3 | 19.337 10-3 |
| 9806,65 | 9 80665 10-2 | 0,1 | 0.096784 | 73556 | 1 m of water. Art. | 1,4223 |
| 6894,76 | 68 948 10-3 | 70.307 10-3 | 68,046 10-3 | 51,715 | 0,70307 | 1 lb/in² |
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To find out how many millimeters of mercury are in the atmosphere, you need to use a simple web calculator. Enter the number of millimeters of mercury you want to change in the left field. In the field on the right you will see the calculation result.
If you need to convert millimeters to mercury or other atmospheric units, click on the appropriate link.
What is “millimeter mercury”
Additional system millimeter of mercury (mmHg)
R. mmHg Art.), sometimes called "torr", is equal to 101 325/760 ≈ 133 322 368 4 Pa. Atmospheric pressure was measured by a mercury barometer, hence the name of this unit of measurement. At sea level, the atmospheric pressure is approximately 760 mmHg. Art. or 101,325 Pa, so the value is 101,325/760 Pa. This device is traditionally used in vacuum technology, blood pressure measurements and weather reporting.
Unit converter
Some instruments measure millimeters of water (1 mm Hg, V = 13951 mm water, V.), and "Hg" (Hg) = 3.386389 kPa at 0° found in the United States and Canada C .
What is "atmosphere"
A non-systematic pressure measurement unit that approximates atmospheric pressure at global ocean level.
In addition, two units are the technical atmosphere (at, at) and the normal, standard or physical atmosphere (atm, atm). One technical atmosphere is a single perpendicular force of 1 kg force on a flat surface of 1 cm2.
1 at. = 98.066.5 Pa. The standard atmosphere is a 760mm mercury column with a mercury density of 13,595.04 kg/m³ and zero temperature.
1 atm = 101,325 Pa = 1.0323233 at. Russian Federation uses only the technical atmosphere.
In the past, the terms "ata" and "ati" were used for absolute and gauge pressure. Excessive pressure is the difference between absolute and atmospheric pressure, when the absolute is greater than atmospheric pressure.
The difference between atmospheric and absolute pressure, when the absolute pressure is lower than atmospheric pressure, is called vacuum (vacuum).
The definition of atmospheric pressure is very simple - it is Atmosphere pressure, what is in it and on the surface of the planet. In other words, atmospheric pressure represents the pressure of one column, which is located on top, with an area of 1 square meter.
Atmospheric pressure measurement
Pressure units are pascals, rods and millimeters of mercury. The latter is used in barometers (special measuring instruments) and is understandable to ordinary people, since many people use barometers.
Many people know that 760 mm of mercury normal pressure(this is the atmospheric pressure at sea, since it is accepted as the norm). Just to add that this is normal at 0°C.
Another popular unit of measurement that is often used in physics is the pascal. The value 101325 Pa is called normal pressure and corresponds to 760 mm of mercury.
Well, the last unit of measurement is the bat.
1 bar = 100,000 Pa. In this case, the normal pressure is 1.01325 bar.
Has anyone heard the expression one atmosphere or three atmospheres, for example?
Mercury mercury
Thus, the atmosphere in this case is called normal pressure (which we discussed above). But a pressure equal to three atmospheres cannot be called normal, since it is three times higher than normal.
To simplify the calculation, in the chemistry concept standard atmospheric pressure.
This is almost the same as normal - 100,000 Pa (100 kPa) or 1 bar.
Man is far from being the king of nature, but her child, an integral part of the universe. We live in a world where everything is strictly interconnected and subordinated to one single system.
Everyone knows that the Earth is surrounded by a dense air mass, which is usually called the atmosphere. And on every object, including the human body, it “compresses” an air column that has certain weight. Scientists have experimentally discovered that every square centimeter of the human body is affected by atmospheric pressure weighing 1033 kilograms.
And if you do some simple math, it turns out that the average person is under 15,550 kg of pressure.
The weight is enormous, but fortunately it is completely insensitive. This may be due to the fact that dissolved oxygen exists in human blood.
What is the effect of atmospheric pressure on humans? A little more about this.
Atmospheric pressure standard
Doctors who talk about what atmospheric pressure is considered normal show a range of 750 ... 760 mm Hg.
This distribution is quite acceptable, since the planet’s topography is not entirely uniform.
Meteorological dependence
Doctors say that some people's bodies can adapt to all conditions.
Even such serious tests as long-distance flights from one climate zone to another are not at all for them.
At the same time, others confined to their homes sense a weather change approaching. This can occur in the form of severe headaches, unexplained weakness or constantly clammy hands, for example.
These people are more likely to have vascular and endocrine disorders than others.
It is especially difficult if the atmospheric pressure is a sharp jump over a short time. According to statistics, the majority of people whose bodies react so strongly to changes in atmospheric pressure are women living in large cities.
Unfortunately, the harsh rhythm of life, overcrowding, and the environment are not the best for health.
If you want, you can get rid of addiction. Just keep going and always have to be. The methods are known to everyone. This is the basis healthy image life: hardening, swimming, walking, running, healthy eating, adequate sleep, eliminating bad habits, weight loss.
How does our body react to increased atmospheric pressure?
Atmospheric pressure (standard for humans) is an ideal 760 mmHg. But this indicator is very rare.
Due to the increase in atmospheric pressure, clear weather conditions, there are no sudden changes in humidity and air temperature. Such changes actively respond to hypertension and allergies in the body.
In a situation in the city, without wind, it is natural to pollute the gas.
Firstly, patients with respiratory diseases.
Increasing atmospheric pressure also affects immunity.
Conversion of millimeters of mercury into the atmosphere
This is reflected in a decrease in leukocytes in the blood. A weakened body will not easily control infections.
Doctors advise:
Start your day off easy morning exercises. Take a contrast shower. For breakfast, give priority to foods that contain a lot of potassium (cottage cheese, raisins, dried apricots, bananas). Do not allow any more food.
Do not eat. This day is not the most successful for great physical effort and emotions. When you return home, take a break from one hour, do your usual homework, go early.
Low atmospheric pressure and good health
Low atmospheric pressure, that's how much? You can answer a conditional question if the barometer data is less than 750 mm.st. But it all depends on the region of residence.
Especially for Moscow, the numbers are 748-749 mm Hg. are the norm.
Among the first, I think this is a deviation from the norm of the “core” and those with intracranial pressure. Complaints in general include nausea, frequent migraines, lack of oxygen, difficulty breathing and pain in the intestines.
Doctors advise:
Get your blood pressure back to normal.
Reduce physical activity. Every working hour brings ten minutes of rest. Drink fluids more often, prefer green tea with honey. Drink your morning coffee. Take the herbal tinctures shown for sails. Relax in the evening under a contrast shower. Go to bed before your usual hour.
How Humidity Changes Affect Your Body
Low humidity of 30-40% is not beneficial. This irritates the nasal mucosa. Firstly, these abnormalities are the first, asthma and allergies.
To help in this case, the mucous membrane of the nosopharynx can be moistened with a slightly saline aqueous solution.
Frequent precipitation, of course, increases air humidity to 70-90 percent. This also has a negative impact on health.
High humidity may cause worsening of chronic kidney and joint diseases.
Doctors advise:
If possible, change the climate to a dry one. Reduce retention time in wet weather. Go out for a walk in warm clothes. Remember the vitamins
Atmospheric pressure and temperature
The optimal temperature for a person in a room is not higher than +18.
This is especially true in the bedroom.
How does the interaction between atmospheric pressure and oxygen develop?
In the event of an increase in air temperature and a simultaneous decrease in atmospheric pressure, people suffering from diseases, cardiovascular and respiratory organs suffer.
If the temperature decreases and the atmospheric pressure increases, it becomes bad for hypertensives, asthmatics and patients with stomach and genitourinary problems.
In the event of sudden and multiple temperature fluctuations, an unbearably large amount of histamine, the main pathogen that causes allergies, is formed in the body.
Good to know
What is normal atmospheric pressure for the person you know now?
This is 760 mm Hg. Art., But such barometers are very rare.
It is also important to know that the change in atmospheric pressure with altitude (with a rapid decrease) is quite dramatic. Because of this difference, a person who climbs a mountain quickly may lose consciousness.
In Russia, atmospheric pressure is measured in mm Hg. Art. But the international system has its own unit of measurement, the pascal.
At the same time, normal atmospheric pressure in pascals will be 100 kPa. If you convert our 760 mm Hg. in Pascal, normal atmospheric pressure in Pascals for our country will be 101.3 kPa.