Quite often, when calculating water supply or heating parameters, it is necessary to convert bars to atm or atm to MPa, since various sources (reference books, technical literature, etc.) may indicate pressure values in different units of measurement. For convenience, we present you a summary table for converting pressure measurement units:
|
Units |
bar |
mmHg |
mm water column |
atm (physical) |
kgf/m 2 |
kgf/cm 2
|
Pa |
kPa |
MPa |
| 1 bar | 1 | 750,064 | 10197,16 | 0,986923 | 10,1972 ∙10 3 | 1,01972 | 10 5 | 100 | 0,1 |
| 1 mmHg | 1,33322 ∙10 -3 | 1 | 13,5951 | 1,31579 ∙10 -3 | 13,5951 | 13,5951 ∙10 -3 | 133,322 | 133,322 ∙10 -3 | 133,32 ∙10 -6 |
| 1 mm water column | 98,0665 ∙10 -6 | 73,5561 ∙10 -3 | 1 | 96,7841 ∙10 -6 | 1 | 0,1 ∙10 -3 | 9,80665 | 9,80665 ∙10 -3 | 9,8066 ∙10 -6 |
| 1 atm | 1,01325 | 760 | 10,3323 ∙10 3 | 1 | 10,3323 ∙10 3 | 1,03323 | 101,325 ∙10 3 | 101,325 | 101,32 ∙10 -3 |
| 1 kgf/m 2 | 98,0665 ∙10 -6 | 73,5561 ∙10 -3 | 1 | 96,7841 ∙10 -6 | 1 | 0,1 ∙10 -3 | 9,80665 | 9,80665 ∙10 -3 | 9,8066 ∙10 -6 |
| 1 kgf/cm 2 | 0,980665 | 735,561 | 10000 | 0,967841 | 10000 | 1 | 98,0665 ∙10 3 | 98,0665 | 98,066 ∙10 -3 |
| 1 Pa | 10 -5 | 7,50064∙10 -3 | 0,1019716 | 9,86923 ∙10 -6 | 101,972 ∙10 -3 | 10,1972 ∙10 -6 | 1 | 10 -3 | 10 -6 |
| 1 kPa | 0,01 | 7,50064 | 101,9716 | 9,86923 ∙10 -3 | 101,972 | 10,1972 ∙10 -3 | 10 3 | 1 | 10 -3 |
| 1 MPa | 10 | 7,50064 ∙10 3 | 101971,6 | 9,86923 | 101,972 ∙10 3 | 10,1972 | 10 6 | 10 3 | 1 |
|
The SI system includes:
|
Engineering units:
|
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Detailed list of pressure units:
- 1 Pa (N/m 2) = 0.0000102 Atmosphere (metric)
- 1 Pa (N/m 2) = 0.0000099 Standard atmosphere Atmosphere (standard) = Standard atmosphere
- 1 Pa (N/m2) = 0.00001 Bar / Bar
- 1 Pa (N/m2) = 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 Hectopascals
- 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
- 1 Pa (N/m2) = 0.0075006 Millimeter of mercury (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 force per square meter. ft / Pound force/square foot
- 1 Pa (N/m2) = 0.000145 Pounds 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 square meter. ft / Ton (short)/foot 2
- 1 Pa (N/m 2) = 10 -7 Tons per sq. inch / Ton/inch 2
- 1 Pa (N/m2) = 0.0075006 Torr / Torr
Pascal (Pa, Pa)
Pascal (Pa, Pa) - unit of measurement of pressure in International system units of measurement (SI system). The unit is named after the French physicist and mathematician Blaise Pascal.
Pascal is equal to the pressure caused by a force equal to one newton (N) uniformly distributed over a surface of one square meter normal to it:
1 pascal (Pa) ≡ 1 N/m²
Multiples are formed using standard SI prefixes:
1 MPa (1 megapascal) = 1000 kPa (1000 kilopascals)
Atmosphere (physical, technical)
Atmosphere is an off-system unit of pressure measurement, approximately equal to atmospheric pressure on the Earth's surface at the level of the World Ocean.
There are two approximately equal units with the same name:
- Physical, normal or standard atmosphere (atm, atm) - exactly equal to 101,325 Pa or 760 millimeters of mercury.
Technical atmosphere (at, at, kgf/cm²)- equal to the pressure produced by a force of 1 kgf, directed perpendicularly and uniformly distributed over a flat surface with an area of 1 cm² (98,066.5 Pa).
1 technical atmosphere = 1 kgf/cm² (“kilogram-force per square centimeter”). // 1 kgf = 9.80665 newtons (exact) ≈ 10 N; 1 N ≈ 0.10197162 kgf ≈ 0.1 kgf
On English kilogram-force is denoted as kgf (kilogram-force) or kp (kilopond) - kilopond, from the Latin pondus, meaning weight.
Notice the difference: not pound (in English “pound”), but pondus.
In practice, they approximately take: 1 MPa = 10 atmospheres, 1 atmosphere = 0.1 MPa.
Bar
A bar (from the Greek βάρος - heaviness) is a non-systemic unit of pressure measurement, approximately equal to one atmosphere. One bar is equal to 105 N/m² (or 0.1 MPa).
Relationships between units of pressure
1 MPa = 10 bar = 10.19716 kgf/cm² = 145.0377 PSI = 9.869233 (physical atm.) = 7500.7 mm Hg.
1 bar = 0.1 MPa = 1.019716 kgf/cm² = 14.50377 PSI = 0.986923 (physical atm.) = 750.07 mm Hg.
1 atm (technical atmosphere) = 1 kgf/cm² (1 kp/cm², 1 kilopond/cm²) = 0.0980665 MPa = 0.98066 bar = 14.223
1 atm (physical atmosphere) = 760 mm Hg = 0.101325 MPa = 1.01325 bar = 1.0333 kgf/cm²
1 mm Hg = 133.32 Pa = 13.5951 mm water column
Volumes of liquids and gases / Volume
1 gl (US) = 3.785 l
1 gl (Imperial) = 4.546 l
1 cu ft = 28.32 l = 0.0283 cubic meters
1 cu in = 16.387 cc
Flow speed
1 l/s = 60 l/min = 3.6 cubic meters/hour = 2.119 cfm
1 l/min = 0.0167 l/s = 0.06 cubic meters/hour = 0.0353 cfm
1 cubic m/hour = 16.667 l/min = 0.2777 l/s = 0.5885 cfm
1 cfm (cubic feet per minute) = 0.47195 l/s = 28.31685 l/min = 1.699011 cubic meters/hour
Throughput / Valve flow characteristics
Flow coefficient (factor) Kv
Flow Factor - Kv
The main parameter of the shut-off and control body is the flow coefficient Kv. The flow coefficient Kv shows the volume of water in cubic meters per hour (cbm/h) at a temperature of 5-30ºC passing through the valve with a pressure loss of 1 bar.
Flow coefficient Cv
Flow Coefficient - Cv
In countries with an inch measurement system, the Cv coefficient is used. It shows how much water in gallons/minute (gpm) at 60ºF flows through a fixture when there is a 1 psi pressure drop across the fixture.
Kinematic viscosity / Viscosity
1 ft = 12 in = 0.3048 m
1 in = 0.0833 ft = 0.0254 m = 25.4 mm
1 m = 3.28083 ft = 39.3699 in
Units of force
1 N = 0.102 kgf = 0.2248 lbf
1 lbf = 0.454 kgf = 4.448 N
1 kgf = 9.80665 N (exactly) ≈ 10 N; 1 N ≈ 0.10197162 kgf ≈ 0.1 kgf
In English, kilogram-force is expressed as kgf (kilogram-force) or kp (kilopond) - kilopond, from the Latin pondus, meaning weight. Please note: not pound (in English “pound”), but pondus.
Units of mass
1 lb = 16 oz = 453.59 g
Moment of force (torque)/Torque
1 kgf. m = 9.81 N. m = 7.233 lbf * ft
Power Units / Power
Some values:
Watt (W, W, 1 W = 1 J/s), horsepower (hp - Russian, hp or HP - English, CV - French, PS - German)
Unit ratio:
In Russia and some other countries 1 hp. (1 PS, 1 CV) = 75 kgf* m/s = 735.4988 W
In the USA, UK and other countries 1 hp = 550 ft*lb/s = 745.6999 W
Temperature
Fahrenheit temperature:
[°F] = [°C] × 9⁄5 + 32
[°F] = [K] × 9⁄5 − 459.67
Temperature in Celsius:
[°C] = [K] − 273.15
[°C] = ([°F] − 32) × 5⁄9
Kelvin temperature:
[K] = [°C] + 273.15
[K] = ([°F] + 459.67) × 5⁄9
Below are the pressure units that are used to describe the parameters of compressor equipment, blowers and vacuum pumps
| MPa | bar | mmHg | atm. | kgf/cm2 | PSI | |
|---|---|---|---|---|---|---|
| 1 MPa = | 1 | 10 | 7500,7 | 9,8692 | 10,197 | 145,04 |
| 1 bar = | 0,1 | 1 | 750,07 | 0,98692 | 1,0197 | 14,504 |
| 1mmHg= | 133.32 Pa | 1,333*10 -3 | 1 | 1,316*10 -3 | 1,359*10 -3 | 0,01934 |
| 1 atm. = | 0,10133 | 1,0133 | 760 | 1 | 1,0333 | 14,696 |
| 1 kgf/cm 2 = | 0,098066 | 0,98066 | 735,6 | 0,96784 | 1 | 14,223 |
| 1 PSI = | 6.8946 kPa | 0,068946 | 51,715 | 0,068045 | 0, 070307 | 1 |
The table gives the following designations: MPa - megapascal or 10 6 Pa (Pascals), 1 Pa = 1 N/m 2; mmHg - millimeter of mercury; atm. - physical atmosphere; at. =1 kgf/cm 2 - technical atmosphere; PSI (pounds per square inch) - pound per square inch (a unit of pressure used in the US and UK).
The pressure value can be counted from 0 (absolute pressure or ground in English terminology) or from atmospheric pressure (excess pressure or induced in English). If, for example, pressure is measured in technical atmospheres, then absolute pressure is designated as ata, and excess pressure as ati, for example, 9 ata, 8 ati.
Units for measuring the performance of compressors and vacuum pumps
Compressor performance is measured as the volume of compressed gas per unit of time. The basic unit used is cubic meter per minute (m 3 /min). The units used are l/min. (1 l/min = 0.001 m 3 /min.), m 3 /hour (1 m 3 /hour = 1/60 m 3 /min.), l/s (1 l/s = 60 l/min. = 0.06 m 3 /min). Productivity is usually given either for suction conditions (gas pressure and temperature) or for normal conditions (pressure 1 atm., temperature 0 o C). In the latter case, the letter “n” is placed in front of the unit of volume (for example, 5 nm 3 /min). In English-speaking countries, cubic foot per minute (CFM) is used as a unit of productivity. 1 CFM = 28.3168 l/min. = 0.02832 m 3 /min. 1 m 3 /min =35.314 CFM.
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1 megapascal [MPa] = 0.101971621297793 kilogram-force per square meter. millimeter [kgf/mm²]
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 per square meter piezo barium (barium) Planck pressure meter sea water foot of sea water (at 15°C) meter of water. column (4°C)
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 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, it is the relative pressure that is shown.
Atmospheric pressure
Atmospheric pressure is the air pressure at a given location. 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 people 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 atmospheric pressure at cruising altitude 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 necessary measures precautions so as not to get sick due to the fact that the body is not accustomed 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 large number 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. Devices for measuring blood pressure are 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 gemstones, which are mainly formed 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. Temperature increases by 25°C for every kilometer below 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 is gaining popularity in lately. Some buyers prefer natural gemstones, but man-made gemstones are becoming more and more popular due to their low price and lack of hassles associated with mining 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 are often coated with diamond dust, which is also used in abrasives and materials. Most diamonds in production are of artificial origin due to low prices 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.
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