1 kPa - approximately the pressure exerted by a 10 g of mass on a 1 cm 2 area.10 Pa - the pressure below 1 mm of water.1 hectoPascal = 100 Pascal = 1 millibar.The unit kiloPascal (kPa) is commonly used in the design of technical applications - like HVAC systems, piping systems and similar. Since 1 Pa is a small pressure unit the unit hectoPascal (hPa) is widely used, especially in meteorology. In imperial units the Standard Atmospheric Pressure is 14.696 psi. The temperature of 293 oK (20 oC) is sometimes used. The Standard Atmospheric Pressure is defined at sea-level at 273 oK (0 oC) and is 1.01325 bar or 101325 Pa (absolute). The Standard Atmospheric Pressure ( atm) is normally used as the reference when listing gas densities and volumes. The atmospheric pressure varies with temperature and altitude above sea level. This pressure is often called the gauge pressure and can be expressed asĪtmospheric pressure is the pressure in the surrounding air at - or "close" to - the surface of the earth. Gauge PressureĪ gauge is often used to measure the pressure difference between a system and the surrounding atmosphere. All calculations involving the gas law requires pressure (and temperature) to be in absolute units. The absolute pressure - p abs - is measured relative to the absolute zero pressure - the pressure that would occur at absolute vacuum.
The basic unit for mass is slug and the unit for force is pound ( lb) or pound force ( lb f). P = pressure (lb/in 2 (psi), lb/ft 2 (psf), N/m 2, kg/ms 2 (Pa))ġ) In the Imperial - English Engineering System special care must be taken for the force unit. The equation for pressure can be expressed as: "the normal force per unit area exerted on a imaginary or real plane surface in a fluid or a gas"
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