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3.MA1Thermodynamics
phase change and heat transfer
| Term | Definition |
|---|---|
| evaporation | process of going from a liquid to a gas |
| condensation | process of going from a gas to a liquid |
| sublimation | phase change from a solid directly to a gas |
| absolute zero | coldest possible temperature at which all Brownian motion stops; 0 Kelvin. |
| temperature | average kinetic energy of an atom |
| heat | movement of thermal energy between objects that are different temperatures |
| thermal energy | TOTAL KE of all the atoms in a sample of a substance |
| joule | SI Unit for heat (and energy) |
| specific heat | amount of energy needed to increase the temperature of a gram of something 1 degree Celsius |
| conduction | heat transfer through direct contact or touching (EX- touching an iron) |
| convection | heat transfer through currents (density); occurs in liquids or gases (EX- heating a room) |
| radiation | heat transfer through empty space that is then absorbed by a substance or object (EX- fire) |
| melting point | temperature at which a solid turns into a liquid. |