Diffusion-Coefficients of some gases

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at 0°C and 101.3 kPa

Gas

Hydrogen
Helium
Nitrogen
Oxygen
Argon
Carbon dioxide
R-12
R-22
Water vapour
relative molecular mass

2.02
4
28
32
39.9
44
121
86.5
18
Diffusions-Coefficient
[mm2/s]
67.1
69.7
17.5
17.5
14.7
13.4
8.3
9.5
21.9

Note: Helium has the largest diffusion coeffcient