Air - Diffusion Coefficients of Gases in Excess of Air

Diffusion coefficients (D12) for gases in large excess of air at temperatures ranging 0 - 400 °C. Calculate and visualize how the diffusion coefficient varies with temperature for different gases based on Fick's first law of diffusion.

Gas	Formula	0 °C	20 °C	100 °C	200 °C	300 °C	400 °C
Argon	Ar	0.167	0.189	0.289	0.437	0.612	0.81
Methane	CH4		0.21	0.321	0.485	0.678	0.899
Carbon monoxide	CO		0.208	0.315	0.475	0.662	0.875
Carbon dioxide	CO2		0.16	0.252	0.39	0.549	0.728
Hydrogen	H2		0.668	0.756	1.153	1.747	2.444	3.238
Water vapour	H2O		0.219	0.242	0.399	0.638	0.873	1.135
Helium	He		0.617	0.697	1.057	1.594	2.221	2.933
Sulfur hexafluoride	SF6		0.15	0.233	0.329	0.438

Calculator

Inputs

Temperature (°C)

Gas Type

Results

Diffusion Coefficient (D12)-- cm²/s