4. The thermal contact resistance between two layers is: a. Directly proportional to the pressure applied to attach the two layers b. Inversely proportional to the pressure applied to attach the two layers c. Not related to the pressure applied to attach the two layers d. None of the above 5. The thermal diffusivity of a material gives indication about: a. How fast heat is conducted through the material b. How much heat is generated inside the material c. How uniform heat diffuses inside the material d. None of the above