While it's true that helium will have a lower practical heat capacity due to lower density, it still has far higher thermal conductivity than air at the same pr

While it's true that helium will have a lower practical heat capacity due to lower density, it still has far higher thermal conductivity than air at the same pressure. http://www.engineersedge.com/heat_transfer/thermal-conductivity-gases.htm http://www.engineersedge.com/heat_transfer/thermal-conductiv...