Final answer:
Sublimation is the direct phase change from solid to gas, bypassing the liquid phase. It has a specific heat associated with it, like the 620 cal/g for H2O sublimation.
Explanation:
Sublimation is the process in which a substance changes phase directly from a solid to a gas without passing through the liquid phase. For example, the sublimation of H2O occurs at a heat of sublimation of 620 cal/g. Sublimation is distinct from processes like condensation, evaporation, and distillation.
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