| A | B |
|---|
| average kinetic energy | temperature |
| internal energy of a system | heat |
| an instrument to measure heat exchange | calorimeter |
| heat + work | enthalpy |
| to go from the solid to the liquid phase | melt |
| to go from the liquid to the solid phase | freeze |
| to go from a liquid to the gas phase | evaporate |
| to go from the gas phase to the liquid phase | condense |
| a reaction which puts heat out into the environment | exothermic |
| a reaction that takes heat into the environment | endothermic |
| the amount of heat needed to raise the temperature of one gram of substance by 1 degree C | specific heat |
| amount of heat needed to raise the temperature of 1 g of water by 1 degree C | calorie |
| the official system internationale (SI) unit for energy | Joule |
| How heat flows | from hot to cold |
| absolute zero | O K - the temperature at which all molecular motion stops |
