Pressure & Gas Thermal Conductivity?

According to data I have, it increases with pressure, but slowly, << proportional.

At 0°C - 1 bara, k = 0.238 kcal/kg/°C, at 100 bara, k = 0.298 kcal/kg/°C, approx linearly in between.

Thank you so much for the answer you already posted!

Specifically, I need information on helium between 1 and 200 atmospheres. Also, how should I be looking this sort of information up. I have been going in circles trying to find it!

Thanks Again!

Scott

This is codemaster, on another computer and can't get it to log in.

Re earlier posting - I gave data for specific heat, not thermal conductivity, and for air, whereas question just said gas. Profuse apologies! should have read it more carefully.

If I can find anything about thermal conductivity of helium vs pressure I'll get back on.

Only data on helium I can find says ~ 0.15 watt/m/K at room temp. Data given over temp range from 0.08K (k = 4.4*10^-5 watt/m/K) to 5000K (k = 1.27 watt/m/K)

It doesn't say at what pressure, or mention variation with pressure, suggesting it's independent of, as noted by Marcial.

Except for high vacuums, the thermal conductivity of a gas is not affected by pressure- Kern, Process Heat Transfer.