| A | B |
|---|
| melting | changing from solid to liquid |
| freezing | changing from liquid to solid |
| boiling | heated to the point where all particles have enough energy to vaporize at ambient air pressure |
| evaporation | changing from a liquid to a gas |
| condensation | changing from a gas to a liquid |
| sublimation | changing directly from a solid to a gas |
| BTU | British thermal unit, heat unit used in rating air conditioners and furnaces |
| calorie | amount of energy to change one gram of water by one degree Celsius |
| Joule | amount of energy equivalent to one Newton of force moving a distance of one meter, 4.2 of these equal one calorie |
| Thermodynamics | the science of energy flow through a system |
| temperature | the average kineitic energy of the particles in a sample of matter |
| Heat of Fusion | the amount of heat required to change a unit mass of a substance at its melting point from a solid to a liquid (or vice versa) without a change in temperature |
| Heat of Vaporization | the amount of heat required to change a unit mass of a substance at its melting point from a liquid to a gas (or vice versa) without a change in temperature |
| Specific Heat | the amount of heat required to measure one unit mass of a substance one temperature unit |
| Dietary Calorie | a kilocalorie, equal to 1000 calories |
