heat 數問

Question

1.若果話temperature,,,
a. is a measure of the total kinetic energy of the molecules making up the body
b. is the property of a body that controls the direction of heat flow
對定錯? why ?

2.Is evaporation a process of heat tansfer like conduction, convection and radiation ??why??

3.Only over-exposure to infra-red causes sunburn?? why??

4. When a gas change directly to gas, does it aborbs latent heat ? what kind of latent heat is it? does it a process of sublime?? why?

Answer 1

1. both a and b are correct.

2. No. Evapoartion involves heat absorption by the object itself, it is not a heat transfer process.

3. Infrared radiation causes a change in the skin pigment. Too intense infrared would cause harm to skin.

4. Latent heat is still absorbed in the process of sublimation as the potential energy of the molecules have been increased.