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Conversion of a substance from the liquid or solid phase into the gaseous (seegas), or vapour, phase. It includes boiling, in which vapour bubbles form in a liquid, and sublimation, in which a solid is converted directly to vapour. Vaporization requires that heat (the substance's latent heat of vaporization) be supplied to the liquid or solid; the same amount of heat is released by the substance in condensation, the reverse of vaporization. If the surroundings do not supply enough heat, the temperature of the remaining substance undergoing vaporization drops. See alsoevaporation.
This entry comes from Encyclopædia Britannica Concise. For the full entry on vaporization, visit Britannica.com.