Every motorist at least once met with poorly inflated or pumped tires. In the first case, fuel consumption increases, the car obeys the steering wheel more slowly, accelerates weaker, and tire wear accelerates. At the same time, the car's patency in snow and mud is improved, and it feels like the car becomes softer. In the second case, the car reacts faster to steering movements, accelerates more easily, but is less stable in high-speed turns and when driving over rough terrain. Each automaker recommends a certain tire pressure for their cars, at which they behave most correctly. At the same time, some indicate pressure in atmospheres, others in bars, and others in psi. In this article, we will explain what is the difference between these units of measurement and what is the relationship between them.

What is atmosphere

By atmosphere is meant a pressure equal to 1 kg per cm², or approximately 0.1 MPa (megaPascal). At the same time, there are two atmospheric standards - technical (at, at) and physical (atm, atm), the difference between which is very small. For example, one technical atmosphere corresponds to 735.56 mmHg, while 1 atm corresponds to 760 mmHg. When applied to automobile wheels, it is generally accepted that the technical atmosphere is equal to the physical one. And approximately the same corresponds to 1 bar (750.06 mm of mercury).

What does PSI mean?

Psi means pressure in pounds per inch² and 1 psi corresponds to 51.715 mm of mercury, which is approximately 14 times less than that of the atmosphere. This definition of pressure is accepted in countries that live according to the inch (English) system of measures, because in those countries few people know what 1 atmosphere equals.

Convert from PSI to atmospheres or bar

There is a simple rule that will help you convert pressure from psi to atmospheres or bar with acceptable accuracy. To do this, the pressure in psi must be divided by 14. The result will be the pressure in bars or technical (physical) atmospheres. For many machines, normal pressure is 26 psi, that is, 1.8 atmospheres. In summer, you can increase the pressure to 28–29 psi, which will be 1.9–2.0 atm. In winter, if there is snow or ice on the roads, it is advisable to drop the tire pressure to 23–25 psi, which corresponds to 1.6–1.7 atm.

Correct tire pressure is one of the keys to safe and economical driving, but it is not always possible to use a compressor that shows the pressure in the usual values. After reading this article, you learned how to convert pressure from psi to atm, so that you can always maintain optimal tire pressure.

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Initial value

Converted value

pascal exapascal petapascal terapascal gigapascal megapascal kilopascal hectopascal decapascal decipascal centipascal millipascal micropascal nanopascal picopascal femtopascal attopascal newton per sq. newton meter per sq. centimeter newton per sq. millimeter kilonewton per sq. meter bar millibar microbar dynes per sq. centimeter kilogram-force per sq. meter kilogram-force per sq. centimeter kilogram-force per sq. millimeter gram-force per sq. centimeter ton-force (short) per sq. ft ton-force (short) per sq. inch ton-force (L) per sq. ft ton-force (L) per sq. inch kilopound-force per sq. inch kilopound-force per sq. inch lbf/sq. ft lbf/sq. inch psi poundal per sq. ft 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 w.c. column (4°C) inch w.c. head of water (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 pieza barium (barium) Planck pressure meter sea ​​water foot of sea water (at 15°C) meter of water column (4°C)

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More about pressure

General information

In physics, pressure is defined as the force acting per unit area of ​​a surface. If two identical forces act on one large and one smaller surface, then the pressure on the smaller surface will be greater. Agree, it is much worse if the owner of studs steps on your foot than the mistress of sneakers. For example, if you press with a blade sharp knife on 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 through the vegetable. If you press with the same force on a tomato or carrot with a blunt knife, then most likely the vegetable will not be cut, since the surface area of ​​\u200b\u200bthe 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 it 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 air pressure at a given location. It usually refers to the pressure of a column of air per unit surface area. A change in atmospheric pressure affects the weather and air temperature. People and animals suffer from severe pressure drops. Low blood pressure causes problems for humans and animals varying degrees severity, from mental and physical discomfort to fatal diseases. For this reason, aircraft cabins are maintained at a pressure 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 necessary measures precautions so as not to get sick due to the fact that the body is not used to such low pressure. Climbers, for example, can get altitude sickness associated with a lack of oxygen in the blood and oxygen starvation of the body. This disease is especially dangerous if you are in the mountains. long time. Exacerbation of altitude sickness leads to serious complications such as acute mountain sickness, high altitude pulmonary edema, high altitude cerebral edema, and acute 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, to drink plenty of fluids, and to climb to altitude gradually, for example, on foot rather than in transport. It is also good to eat a large number of carbohydrates, and have a good rest, especially if the climb uphill happened quickly. These measures will allow the body to get used to the lack of oxygen caused by low atmospheric pressure. If these guidelines are followed, the 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 respiratory rate.

First aid in such cases is provided immediately. It is important to move the patient to a lower altitude where atmospheric pressure is higher, preferably lower than 2400 meters above sea level. Drugs and portable hyperbaric chambers are also used. These are lightweight, portable chambers that can be pressurized with a foot pump. A patient with mountain sickness is placed in a chamber in which pressure is maintained corresponding to a lower altitude above sea level. This camera is used only for providing the first medical care, after which the patient must be lowered.

Some athletes use low blood pressure to improve circulation. Usually, for this, training takes place under normal conditions, and these athletes sleep in a low-pressure environment. Thus, their body gets used to the 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, special tents are produced, the pressure in which is regulated. Some athletes even change the pressure throughout the bedroom, but sealing the bedroom is an expensive process.

suits

Pilots and cosmonauts have to work in a low pressure environment, so they work in spacesuits that allow them to compensate for 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 huge role not only in engineering and physics, but also in medicine. For example, blood pressure is the hydrostatic pressure of blood on the walls 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 the heartbeat. Instruments for measuring blood pressure are called sphygmomanometers or tonometers. The unit of blood pressure is millimeters of mercury.

The Pythagorean mug is an entertaining vessel that uses hydrostatic pressure, 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 is a curved U-shaped tube hidden under the dome. One end of the tube is longer, and ends with a hole in the stem of the mug. Another, more short end, is connected by a hole to the inner 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 tank. 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 due to hydrostatic pressure. If the level, on the contrary, is lower, then the mug can be safely used.

pressure in geology

Pressure is an important concept in geology. Formation is impossible without pressure precious stones both natural and artificial. 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 is formed at the bottom of rivers, lakes, or seas. Over time, more and more sand accumulates over these remnants. 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 rises 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 medium, natural gas may be formed instead of oil.

natural gems

Gem formation is not always the same, but pressure is one of the main constituent parts 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 due to magma. Some diamonds come to Earth from meteorites, and scientists believe they were formed on Earth-like planets.

Synthetic gems

The production of synthetic gemstones began in the 1950s and is gaining popularity in recent times. Some buyers prefer natural gemstones, but artificial gemstones are becoming more and more popular due to the low price and lack of problems associated with mining natural gemstones. Thus, many buyers choose synthetic gemstones because their extraction and sale is not associated with the violation of human rights, child labor and the financing of wars and armed conflicts.

One of the technologies for growing diamonds in the laboratory is the method of growing crystals under high pressure and high temperature. In special devices, carbon is heated to 1000 ° C and subjected to a pressure of about 5 gigapascals. Typically, a small diamond is used as the seed crystal, and graphite is used for the carbon base. A new diamond grows from it. 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 natural stones. The quality of synthetic diamonds depends on the method of their cultivation. Compared to natural diamonds, which are most often transparent, most artificial 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 highly valued. Cutting tools are often coated with diamond dust, which is also used in abrasives and materials. Most of diamonds in production - artificial origin because of the low price and because the demand for such diamonds exceeds the ability to mine them in nature.

Some companies offer services to create memorial diamonds from the ashes of the deceased. To do this, after cremation, the ashes are cleaned until carbon is obtained, and then a diamond is grown on its basis. Manufacturers advertise these diamonds as a memory of the departed, and their services are popular, especially in countries with a high percentage of wealthy citizens, such as the United States and Japan.

Crystal growth method at high pressure and high temperature

The high pressure, high temperature crystal growth method is mainly used to synthesize diamonds, but more recently, this method has been used to improve natural diamonds or change their color. Different presses are used to artificially grow diamonds. The most expensive to maintain and the most difficult of these is the cubic press. It is mainly used 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 to TCTerms and within a few minutes you will receive an answer.

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1 psi = 0.0703069579640175 kilogram-force per sq. centimeter [kgf/cm²]

Initial value

Converted value

pascal exapascal petapascal terapascal gigapascal megapascal kilopascal hectopascal decapascal decipascal centipascal millipascal micropascal nanopascal picopascal femtopascal attopascal newton per sq. newton meter per sq. centimeter newton per sq. millimeter kilonewton per sq. meter bar millibar microbar dynes per sq. centimeter kilogram-force per sq. meter kilogram-force per sq. centimeter kilogram-force per sq. millimeter gram-force per sq. centimeter ton-force (short) per sq. ft ton-force (short) per sq. inch ton-force (L) per sq. ft ton-force (L) per sq. inch kilopound-force per sq. inch kilopound-force per sq. inch lbf/sq. ft lbf/sq. inch psi poundal per sq. ft 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 w.c. column (4°C) inch w.c. column (4°C) foot of water (4°C) inch of water (60°F) foot of water (60°F) technical atmosphere physical atmosphere decibar wall per square meter pieze barium (barium) Planck pressure meter sea water foot 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 per unit area of ​​a surface. If two identical forces act on one large and one smaller surface, then the pressure on the smaller surface will be greater. Agree, it is much worse if the owner of studs steps on your foot than the mistress of sneakers. For example, if you press the blade of a sharp knife on 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 through the vegetable. If you press with the same force on a tomato or carrot with a blunt knife, then most likely the vegetable will not be cut, since the surface area of ​​\u200b\u200bthe 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 it 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 air pressure at a given location. It usually refers to the pressure of a column of air per unit surface area. A change in atmospheric pressure affects the weather and air temperature. People and animals suffer from severe pressure drops. Low blood pressure causes problems in people and animals of varying severity, from mental and physical discomfort to fatal diseases. For this reason, aircraft cabins are maintained at a pressure 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 so as not to get sick because the body is not accustomed to such low pressure. Climbers, for example, can get altitude sickness 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 the most acute form of 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, to drink plenty of fluids, and to climb to altitude gradually, for example, on foot rather than in transport. It's also good to eat plenty of carbohydrates and get plenty of rest, especially if the climb is fast. These measures will allow the body to get used to the lack of oxygen caused by low atmospheric pressure. If these guidelines are followed, the 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 respiratory rate.

First aid in such cases is provided immediately. It is important to move the patient to a lower altitude where atmospheric pressure is higher, preferably lower than 2400 meters above sea level. Drugs and portable hyperbaric chambers are also used. These are lightweight, portable chambers that can be pressurized with a foot pump. A patient with mountain sickness is placed in a chamber in which pressure is maintained corresponding to a lower altitude above sea level. Such a chamber is used only for first aid, after which the patient must be lowered.

Some athletes use low blood pressure to improve circulation. Usually, for this, training takes place under normal conditions, and these athletes sleep in a low-pressure environment. Thus, their body gets used to the 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, special tents are produced, the pressure in which is regulated. Some athletes even change the pressure throughout the bedroom, but sealing the bedroom is an expensive process.

suits

Pilots and astronauts have to work in a low pressure environment, so they work in spacesuits that allow them to compensate for the low pressure of the 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 engineering and physics, but also in medicine. For example, blood pressure is the hydrostatic pressure of blood against 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 the 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 entertaining vessel that uses hydrostatic pressure, 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 is a curved U-shaped tube hidden under the dome. One end of the tube is longer, and ends with a hole in the stem of the mug. The other, shorter end is connected by a hole to the inner 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 tank. If the liquid level rises above the level of the tube, the liquid overflows into the other half of the tube and flows out due to the hydrostatic pressure. If the level, on the contrary, is lower, then the mug can be safely used.

pressure in geology

Pressure is an important concept in geology. Without pressure, it is impossible to form gemstones, both natural and artificial. High pressure and high temperature are also necessary for the formation of oil from the remains of plants and animals. Unlike gems, which are mostly found in rocks, oil forms at the bottom of rivers, lakes, or seas. Over time, more and more sand accumulates over these remnants. 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 rises 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 medium, natural gas may be formed instead of oil.

natural gems

The formation of gemstones is not always the same, but pressure is one of the main components of 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 due to magma. Some diamonds come to Earth from meteorites, and scientists believe they were formed on Earth-like planets.

Synthetic gems

The production of synthetic gemstones began in the 1950s and has been gaining popularity in recent years. Some buyers prefer natural gemstones, but artificial gemstones are becoming more and more popular due to the low price and lack of problems associated with mining natural gemstones. Thus, many buyers choose synthetic gemstones because their extraction and sale is not associated with the violation of human rights, child labor and the financing of wars and armed conflicts.

One of the technologies for growing diamonds in the laboratory is the method of growing crystals at high pressure and high temperature. In special devices, carbon is heated to 1000 ° C and subjected to a pressure of about 5 gigapascals. Typically, a small diamond is used as the seed crystal, and graphite is used for the carbon base. A new diamond grows from it. 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 of their cultivation. Compared to natural diamonds, which are most often transparent, most artificial 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 highly valued. Cutting tools are 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 to create memorial diamonds from the ashes of the deceased. To do this, after cremation, the ashes are cleaned until carbon is obtained, and then a diamond is grown on its basis. Manufacturers advertise these diamonds as a memory of the departed, and their services are popular, especially in countries with a high percentage of wealthy citizens, such as the United States and Japan.

Crystal growth method at high pressure and high temperature

The high pressure, high temperature crystal growth method is mainly used to synthesize diamonds, but more recently, this method has been used to improve natural diamonds or change their color. Different presses are used to artificially grow diamonds. The most expensive to maintain and the most difficult of these is the cubic press. It is mainly used 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 to TCTerms and within a few minutes you will receive an answer.

Pressure is one of the most commonly measured physical quantities. Majority flow control technological processes in thermal and nuclear power, metallurgy, chemistry associated with pressure measurement or pressure difference between gas and liquid media.

Pressure is a broad concept that characterizes a normally distributed force acting from one body per unit surface of another. If the working medium is a liquid or a gas, then the pressure, characterizing internal energy environment, is one of the main parameters of the state. Pressure unit in the SI system - Pascal (Pa), equal to the pressure created by a force of one newton acting on an area of ​​\u200b\u200bone square meter (N / m2). Multiple units of kPa and MPa are widely used. You can use units such as kilogram-force per square centimeter(kgf/cm2) and square meter(kgf/m2), the latter is numerically equal to millimeter of water column(mm water column). Table 1 shows the listed pressure units and the ratios between them, the conversion and the ratio of pressure units. AT foreign literature the following pressure units are found: 1 inch = 25.4 mm of water. Art., 1 psi = 0.06895 bar.

Table 1. Pressure units. Translation, conversion of pressure units.

Reproduction of the unit of pressure measurement with the highest accuracy in the range of overpressures 10 6 ... 2.5 * 10 8 Pa is carried out by the primary standard, including deadweight pressure gauges, special set weight gauges and a pressure maintenance device. To reproduce the pressure unit outside the specified range from 10 -8 to 4 * 10 5 Pa and from 10 9 to 4 * 10 6, as well as pressure differences up to 4 * 10 6 Pa, special standards are used. The transfer of the unit of pressure measurement from the standards to the working measuring instruments is carried out in multistage. The sequence and accuracy of transferring the unit of pressure measurement to working means, indicating the methods of verification and comparison of readings, are determined by national verification schemes (GOST 8.017-79, 8.094-73, 8.107-81, 8.187-76, 8.223-76). Since the errors increase by 2.5-5 times at each stage of transmission of the unit of measurement, the ratio between the errors of the working pressure measuring instruments and the primary standard is 10 2 2 ... 10 3 .

When measuring, a distinction is made between absolute, gauge and vacuum pressure. Under absolute pressure P, understand the total pressure, which is equal to the sum of atmospheric pressure Pat and excess Pi:

Ra = Ri + Rat

concept vacuum pressure is entered when measuring pressure below atmospheric: Pv = Rat - Ra. Measuring instruments designed to measure pressure and pressure difference are called manometers. The latter are subdivided into barometers, overpressure gauges, vacuum gauges and absolute pressure gauges, depending on the atmospheric pressure, gauge pressure, vacuum pressure and absolute pressure measured, respectively. Pressure gauges designed to measure pressure or vacuum in the range up to 40 kPa (0.4 kgf / cm2) are called pressure gauges and draft gauges. The thrust gauges have a two-sided scale with measurement limits up to ± 20 kPa (± 0.2 kgf/cm2). Differential pressure gauges are used to measure pressure differences.

Recently I encountered such a problem: - not all pneumatic pumps measure tire pressure in technical atmospheres, as we are used to. On many, especially on Chinese pumps, the pressure in the wheels is measured in the PSI indicator, which is mysterious for a Russian person. Usually on budget Chinese compressors they write 300 PSI, probably everyone has seen it. So, this is not a brand name, it is an indicator of tire pressure, in some countries of Europe and America, unfortunately, there is not yet a single standard by which pressure is measured. So what is PSI, and how can we translate it into our atmospheres? Read on, I'll tell you everything ...

The first question is what is it?

Answer: PSI is a measure of the pressure of gas (air) in the wheels and is measured in pounds per square inch. This designation is accepted in Europe and in some regions of the United States. Now many imported pneumatic pumps have a scale on which the pressure is measured exactly in pounds per square inch, or lbf / in² for short, but for a Russian person, this is, to put it mildly, not clear. We usually measure tire pressure in technical atmospheres. So how do you translate one into the other?

Question two - "how to translate"

Answer: Translating is quite easy. And sometimes it’s not really necessary, because on the bodies of foreign cars, tire pressure is written exactly in the PSI indicator, that is, 29 or 35, for example. But now many foreign cars are Russified, so to speak, in a word, Russian foreign cars (are assembled in Russia), they have an indicator on the body in technical atmospheres, and how to figure it out? It is necessary to bring the PSI indicator and the technical atmosphere to one indicator, this is 1 Bar (a unit of gravity, in our case, pressure). One Bar is approximately equal to one technical atmosphere or 14 PSI. That is, from this we can understand that 1 Atm (atmosphere) \u003d 14 PSI. Sometimes the indicator on pneumatic pumps is measured simply in Bar, here you need to remember that 1 Bar \u003d 1 Atm. And some manufacturers measure pressure in Pascals (Pa), then 1 Bar = 100,000 Pa, that is, on the dial of your air pump, there will be indicators like 0.1, 0.2, 0.3 and so on, here the measurement is in MPa (mega Pascals, that is, in millions, and 0.1 MPa \u003d 100,000 Pa, or 1 Bar, or 1 Atm, or 14 PSI). Expanded in all sizes.

Now I will present a small plate with the translation

PSI Atm (Atmospheres)

Here are some of the values. If you need to convert PSI to atmospheres, just divide this figure by 14, thus - 300 PSI \u003d 21 atm, that is, cheap Chinese pumps can withstand pressure up to 21 atmospheres, to be honest, it's hard to believe! But this is a completely different story, and today everything.