Standard Temperature and Pressure Calculator

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Temperature: Kelvin
Pressure: Torr
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Standard Temperature and Pressure is defined as air at 0 C (273.15 K, 32 F) and 1 atm (101.325 kN/m2, 101.325 kPa, 14.7 psia, 0 psig, 29.92 in Hg, 760 torr, 33.95 Ft.H2O, 407.2 In.W.G, 2116.8 Lbs./Sq.Ft.) standard temperature and pressure, standard conditions for measurement of the properties of matter.

The Standard Temperature is the freezing point of pure water, 0 C or 273.15 K. The Standard Pressure is the pressure exerted by a column of mercury (symbol Hg) 760 mm high, often designated 760 mm Hg. This pressure is also called one atmosphere

STP is often used for measuring gas density and volume.

In chemistry and other sciences, STP or standard temperature and pressure is a standard set of conditions for experimental measurements, to enable comparisons to be made between sets of data.

Internationally, the current STP defined by the IUPAC (International Union of Pure and Applied Chemistry) is an absolute pressure of 100 kPa (1 bar) and a temperature of 273.15 K (0 C)

In industry and commerce, it is necessary to define the standard reference conditions of temperature and pressure when expressing a gas volume or a volumetric flow rate because the volume of a gas varies with the temperature and pressure of the gas.