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m&m 5.4

Heat and Changes of State

Melting The changing of a solid into a liquid
Melting point The temperature at which melting occurs
Freezing The changing of a liquid into a solid
Freezing point The temperature at which freezing occurs
Solutes Substances which dissolve in a liquid
Latent heat The "hidden" heat absorbed or released when a substance undergoes a change of state
Heat of fusion The latent heat required to change a given mass of a solid into a liquid without changing its temperature
Evaporation The change of a substance from a liquid into a gas
Volatile Liquids which evaporate rapidly
Nonvolatile Liquids which evaporate slowly
Boil When evaporation occurs throughout the liquid
Boiling point The temperature at which a substance boils
Heat of vaporization The quantity of heat required to change a given amount of liquid already at its boiling point into gas without raising its temperature
Condensation The process of a gas changing into a liquid
Saturation point When the amount of water evaporating equals the amount condensing
Dr. John Gorrie The man who created the first mechanical cooling system
Sublimation When a gas may change directly into a solid by the same process
Plasma The fourth state of matter
Created by: Jer Stephens

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