| A | B |
|---|
| energy | ability to cause a change in matter |
| energy of motion | energy of something that is moving |
| stored energy | energy in matter that can cause matter to move or change |
| heat | energy of motion of tiny particles |
| opaque | materials that block light and keep it from passing through |
| solar energy | the Sun's energy |
| temperature | measure of how hot or cold something is |
| friction | force that makes it hard for two objects to move past eachother when the objects touch |
| conduction | movement of heat by direct contact between particles of matter |
| conductor | material that heat travels through easily |
| insulator | material that does not conduct heat well |
| convection | movement of heat through liquids and gases |
| radiation | movement of heat energy in the form of waves |
| melt | to change from a solid to a liquid |
| evaporate | to change from a liquid to a gas |
| condense | to change from a gas to a liquid |
| freeze | to change to a solid |
