HEAT

5. flow of energy from a warm object to a cooler object
6. process through which a substance changes from a liquid to a solid
9. the process by which a liquid turns into a gas
10. is any substance that has mass and takes up space
13. the process by which water vapor in the air is changed into liquid water
14. when a substance turns from solid phase to gaseous phase, without an intermediate liquid phase first
15. the transition of a substance directly from the gas to the solid state on cooling

1. the transfer of thermal energy between particles of matter that are touching
2. process by which heat is transferred by movement of a heated fluid such as air or water
3. the emission or transmission of energy in the form of waves or particles through space or through a material medium
4. degree of hotness or coldness measured by a thermometer with a numerical scale
7. main source of light and heat energy
8. process in which a solid substance turns into liquid
11. particles of matter are far from each other
12. phase of matter in which atoms or molecules can move freely while remaining in contact with one another
14. a state of matter that retains its shape and density when not confined