| A | B |
|---|
| potential energy | the stored energy something has because of its position or condition |
| kinetic energy | the energy of motion |
| thermal energy | the total kinetic energy of all the particles that make up matter |
| reflect | to bounce off |
| refract | to bend |
| absorb | to take in |
| electric charge | tiny amount of energy in the particles of matter (may be positive or negative) |
| electric current | the movement of an electric charge from one place to another |
| electric circuit | the path that a controlled electric current flows through |
| chemical energy | the energy that holds the particles of matter together |
| light energy | the energy that we can see that affects the properties of matter |
| mechanical energy | the energy of moving objects and parts |
| crest | the top of a wave |
| trough | the bottom of a wave |
| wavelength | the distance between crests or troughs that measures how much energy a wave has |
| matter | anything that takes up space and has mass |
| evaporation | the changing of liquid into a gas |
| water vapor | water in the form of an invisible gas in the air |
