Is heat absorbed during evaporation, or does evaporation occur only when heat is absorbed, or do both happen at the same time?
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In a refrigerator, what is the refrigerant? Is evaporation the result of heat absorption or its cause?
At a constant pressure, the boiling point of a liquid remains fixed; it is a change in heat that causes a phase transition in the liquid. Thus, heat absorption leads to a phase transition, while pressure determines the value of enthalpy.