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- Condensation The physical process by which a vapor becomes a liquid or solid; the opposite to evaporation. In meteorological usage, this term is applied only to transformation from vapor to liquid; any process in which a solid forms directly from its vapor is termed sublimation, as is the reverse process.
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- Coal gasification, Coal liquefaction, evaporation, Municipal Solid Waste (MSW), Parts Per Billion (ppb), Parts Per Million (ppm), Sublimation