Consider conductive heat transfer in He gas. Assuming the billiard ball model: how would you expect the thermal conductivity, diffusion coefficient, and viscosity to change locally if:

a. The local temperature changed from 300 K to 1200 K (i.e. what factor would it increase/decrease)?

b. The temperature was constant, but the gas is now Ar?

c. Now consider the rigorous model using the collision integrals. How do the transport coefficients scale for He with temperature (hint: you may need to curve fit the collision integrals)?