Pfeiffer Vacuum

1.2.2 General gas equation

The following applies for gases: A volume of 22.414 liters (mol volume) at a temperature of 273.15 K (standard temperature = 0 °C) and a pressure of 101,325 pa (standard pressure) contains 6.02 times 1023 particles (Avogadro's number). The mass of the gas thus enclosed is its molecular weight in grams.

DThe general gas equation describes the state of a gas as a function of pressure, temperature and volume.

Formula 1-4:

General gas equation


Formula 1-5:

Gas pressure


p=pressure [Pa; N / m2]
V=volume [m3]
m=mass [kg]
M=molar mass [kg / kmol]
R=general gas constant R = 8.314510 kJ / (kmol K)
T=thermodynamic temperature [K]
n=molecular number density [1 / m3]
k=Boltzmann's constant k = 1.380 · 10-23 J/K
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