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  • Introduction to the Gas Laws
    • What is Pressure?
    • What is Vacuum?
    • Composition of Air
    • What is Partial Pressure?
    • Dalton's Law
    • What is Gas?
    • What is Vapour Pressure?
    • What is mean free path?
    • The mean free path for some gases at 20° C and different pressures.
    • Avogadro's Law
    • What is a Mole?
    • What is a leak rate?
    • Avogadro´s Number
    • The relative masses of molecules
    • Boyle's Law
    • Charles' Law
    • The Law of Gay-Lussac
    • The Universal Gas Law
    • The Universal Gas Constant
    • The Individual Gas Constant
    • Individual gas constants for some gases (J/kg x K)
    • The Greek Alphabet
  • The Flow of Gases in Leaks
  • Helium Leak test on Heat Exchangers
  • Leak Detection and Measuring Methods
  • Leak Detection with Tracer Gas Methods
  • Leak Test with Laser Beam
  • Literature
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Composition of Air

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Air is a mixture of different gases. More than 99% of air consist of nitrogen and oxygen.

The rest are other gases.

Gas
Nitrogen
Oxygen
Argon
Carbon dioxide
Neon
Helium
Krypton
Hydrogen
Xenon
Percent
79,119%
21,224%
0,946%
~0,0334%
0,00184%
0,00053%
0,000116%
0,00005%
0,0000088%

Table 1

 
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