Pressure unit in terms of force and surface unit, there are various units for measuring it, including Pascal, atmosphere, charge, torque, PSI and mm Hg. The following is a brief description of pressure measurement units and their conversion relationships. Also on this page, it is possible to convert pressure units online.

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Units of pressure measurement

Pressure is the physical quantity of a fence and its value is determined only by a number. When a force F enters a surface with area A, it is defined to measure the effect of a force on a quantitative surface, which is obtained by dividing the force F by the surface A and is called pressure.

Pressure is sometimes defined as force-g or force-kg per square centimeter, which are unsuitable units for expressing pressure.

Common pressure units are as follows:

Pascal
Bar
Technical atmosphere
Standard atmosphere
Net
Pound per inch (psi)

Pascal

The unit of pressure measurement in the SI International Instrument is Pascal, denoted by Pa.

Bar

Bar is one of the units of pressure measurement and this unit was introduced by William Naipershaw in 1909. One bar differs from the Earth’s atmospheric pressure by as much as one percent, and because of this small difference with the Earth’s atmospheric pressure, it has become common in European countries.

Atmosphere

The Atmosphere is usually used to measure air and fluid pressure. 1 atmosphere is equal to the pressure caused by a column of water at a height of ten meters and is approximately equal to the average air pressure at the level of open waters off the coast of Paris.

Mm Hg (mmHg)

In a mercury barometer, the amount of pressure is obtained by measuring the height difference between two columns of mercury in a connected pipe, and the amount of pressure caused by a column of mercury at a height of one millimeter is called one millimeter of mercury (mmHg).

Torr

One of the pressure units, the Torr unit, is named after the Italian physicist and mathematician Evangelista Torricelli. The importance of this unit of pressure is that 1 Torr will be approximately equal to 1 mm Hg.

PSI

The unit of measurement of PSI (psi) is based on the English system and is equivalent to pounds per square inch. In simpler terms, each PSI equals the pressure of one pound of force to a surface of one square inch.