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14.1 Matter & Energy

Matter & Thermal Energy

TermDefinition
kinetic theory explanation of the behavior of molecules in matter; states that all matter is made of constantly moving particles that collide without losing energy
melting point temperature at which a solid begins to liquefy
heat of fusion Amount of energy required to change a substance from the solid phase to the liquid phase.
boiling point the temperature at which the vapor pressure of a liquid is equal to the external pressure acting on the surface of a liquid
heat of vaporization The amount of energy required for a liquid at its boiling point to become a gas
sublimation the process of a solid changing directly to a vapor without forming a liquid
plasma matter with enough energy to overcome the attractive forces within its atoms, composed of positively and negatively charged particles
thermal expansion increase in the volume of a substance when the temperature is increased
Created by: lgratz
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