. Applied thermodynamics for engineers. ^ covered with snow. Thevapor process always involves (1)the condensation of the vapor, (2) a lowering of its pressure andtemperature by expansion, (3) evaporation of the liquid in thevaporizer, and (4) compression to the initial state. The under-lying principles are two: the raising of the boiling point by pres-. FiG. 305. Art. 626. — Vapor Cycle. VAPOR REFRIGERATION 463

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