| A | B |
|---|
| Heat | a form of energy in all moving particles of matter |
| Calorie | a unit used to measure the energy content of food |
| calorie | the amount of energy required to raise 1 g of water 1 C |
| Absolute zero | temperature at which particles of matter almost stop moving |
| temperature | the measurement of the average K.E. of particles of matter |
| freezing point | the temperature at which a substance turns from a liquid to a solid |
| melting point | the temperature at which a solid turns to liquid |
| boiling point | the temperature at which a liquid becomes a gas |
| evaporation | the process of going from a liquid to a gas |
| conduction | heat transfer through direct contact |
| convection | heat transfered through a liquid or gas by the changing density of the fluid |
| conductors | substances the allow the flow of energy through them |
| insulators | substances that do not allow the flow of energy through them |
| convection currents | up and down movements of gases or liquids caused by heat transfer |
| radiation | the only type of heat transfer that can take place in a vacuum |
| vacuum | empty space |
| thermal expansion | the volume of a substance increases when the heated |
| gases and liquids | fluids |
| substances that are good conductors | metals |
| substances that are good insulators | glass, plastic, rubber, nonmetals |
