There are three primary phases of matter: solid, liquid and gas. A solid becoming liquid is called melting or fusion. A solid becoming gaseous is called sublimation. A liquid becoming solid is called freezing. A liquid changing to gas is called boiling or evaporation. A gas changing into a solid is called deposition, and a gas changing into a liquid is called condensation. Half of these are endothermic, meaning they absorb heat from their surroundings. The others are exothermic, meaning they release heat.
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Melting: Solid to Liquid
Melting, or fusion as it is sometimes called, is an endothermic reaction.
Sublimation: Solid to Gas
Sublimation is an endothermic reaction.
Boiling/Evaporation: Liquid to Gas
The transition from liquid phase to gas phase is an endothermic reaction.
Freezing: Liquid to Solid
Freezing is an exothermic reaction.
Condensation: Gas to Liquid
Condensation is an exothermic reaction.
Deposition: Gas to Solid
Deposition is an exothermic reaction.
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