Ch. 6 - Thermal Energy & Heat
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15 terms
Terms | Definitions |
|---|---|
 temperature | Measure of the average kinetic energy of the particles in an object |
| radiation | transfer of energy by electromagnetic waves |
| thermal energy | total energy of all the particles in a substance. A substance will expand if its thermal energy increases |
| convection current | circular movement when heated fluid rises and is replaced by cooler fluid |
| heat engine | a device that transforms thermal energy to mechanical energy |
| refrigerator | a device that transfers thermal energy from a cool region to a warm region |
| absolute zero | 0°K |
| liquids | do not have a definite shape. do have a definite volume |
| freezing point | 0°C 32°F |
| types of heat transfers | convection, conduction, radiation |
| wood spoon vs. metal spoon | metal spoon will heat faster in a pot of warm water because metal is a good conductor of heat and wood is not |
| thermal energy transfer | heat is thermal energy that moves from a warmer object to a cooler object. ex. warm feet on tile floor |
| thermal energy vs. temperature | temperature is the AVERAGE KE of the particles in an object whereas thermal energy is the TOTAL energy of all the particles in an object |
| thermostat | controlled by bimetalic strip. cool: strip curls up, lowers switch, mercury flows over wires. warm: strip uncurls, raises switch |
| example of two things that have the same temperatures but different thermal energy | 1 litter hot cocoa = 75° and .2 litter mug of hot cocoa = 75°. 1 litter has more thermal energy because it has more particles |
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