| A | B |
|---|
| conduction | heat transfer in solids (from direct contact with molecules) |
| conductors | substances that conduct heat easily |
| insulators | substances that do not conduct heat easily |
| convection currents | up and down movements of gases or liquids caused by heat transfer |
| convection | heat transfer in gases or liquids |
| radiation | tranfer of heat through space in the form of waves |
| vacuum | empty space |
| calorie | unit of heat |
| when heat is added to water the temp... | rises |
| when heat is removed from water its temp | decreases |
| thermal energy | heat energy |
| heat moves from ____ objects to ____objects | warm, cold |
| temperature | the measure of average kinetic energy |
| 3 ways energy can be tranferred | convection, radiation, conduction |
| endothermic reaction = | absorbs energy |
| exothermic reaction = | gives off energy |
| Most substances _____ when heated and _____ when cooled. | expand, contract |
| How is water different from most substances? | It expands when cooled and contracts when heated |
| example of conduction | putting a spoon in a hot cup of tea - the spoon gets warmer |
| example of convection | smoke rising through a chimney |
| How are the densities of cold and warm water different? | Warm water is less dense (will float), cold water is more dense (will sink) |
| example of radiation | putting your hand near a light bulb, you feel heat on your hand |
| vacuum | empty space |
| Law of Conservation of Energy | energy cannot be created nor destroyed |
| formula for density | D = M / V |
