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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. |