The document describes the five phase changes that matter undergoes: melting, freezing, vaporization, condensation, and sublimation. Melting is when a solid turns to a liquid, freezing is a liquid turning to a solid, vaporization is a liquid becoming a gas, condensation is a gas becoming a liquid, and sublimation is when a solid skips the liquid phase and turns directly to a gas. These phase changes are caused by the addition or removal of heat from the matter.

13. http://www.explorelearning.com/index.cfm?method=cResource.dspDetail&ResourceID=30 Heat goes into the solid as it sublimates. Sublimation Solid to gas Heat leaves the gas as it condenses. Condensation Gas to liquid Heat goes into the liquid as it vaporizes. Vaporization, which includes boiling and evaporation Liquid to gas Heat leaves the liquid as it freezes. Freezing Liquid to solid Heat goes into the solid as it melts. Melting Solid to liquid Heat Movement During Phase Change Term for Phase Change Description of Phase Change Heat goes into the solid as it sublimates. Sublimation Solid to gas Heat leaves the gas as it condenses. Condensation Gas to liquid Heat goes into the liquid as it vaporizes. Vaporization, which includes boiling and evaporation Liquid to gas Heat leaves the liquid as it freezes. Freezing Liquid to solid Heat goes into the solid as it melts. Melting Solid to liquid Heat Movement During Phase Change Term for Phase Change Description of Phase Change