Heat Transfer

3. It flows from a region of higher temperature to a region of lower temperature.
5. Colder air ___________.
7. Rough surfaces are _________ emitters and absorbers of infra-red radiation.
8. Radiation can occur here.
11. The _______ the surface area, the higher the rate of radiation.
12. The transfer of heat in the form of electromagnetic waves.
13. When air is heated, it expands and the density ___________.

1. _______ surfaces are good emitters and absorbers of infra-red radiation.
2. ________ breeze occurs during the night
4. The process of heat transfer through a medium without any movement of the medium.
6. __________ surfaces are poor emitters and absorbers of infra-red radiation.
9. the transfer of heat from one place to another by the movement of the fluids.
10. These are good conductors of thermal energy