Diffusion Coefficient for gases at different temperatures

AI Thread Summary
Diffusion coefficients for gases like hydrogen and methane in air vary significantly with temperature. Specific values for diffusivity at different temperatures, such as hydrogen at 300°C and air at 100°C, are not readily available in standard references. The discussion highlights a need for empirical data rather than theoretical models like Fick's laws, which typically apply to gases at uniform temperatures. Additionally, there is interest in understanding diffusivity for the same gas at varying temperatures. Accurate diffusivity data is crucial for applications in fields such as chemical engineering and environmental science.
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Does anyone know figures for Diffusivity (diffusion coefficients) for two gases at different temperatures.

Such as air - Hydrogen or air-methane.

For example the diffusivity of hydrogen into air when the hydrogen is at 300C and the air at 100C.

Please don't point me to Fick's laws unless you can be specific about how these work for the above as, as far as I am aware they are based on gas at the same temperature.
 
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No one has any ideas?
How about for the same gas at different temp?
 

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