Latent Heat Vaporisation — FRCA Primary MCQ
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Correct answer: A — Convert liquid to vapour at its boiling point without a temperature change
Latent heat of vaporisation is the energy required to convert a unit mass of liquid to vapour at its boiling point without changing temperature. This energy is absorbed from the remaining liquid causing cooling (hence vaporiser output drops without temperature compensation). Units are kJ/kg or kJ/mol.
Reference: Al-Shaikh Stacey 2019 Essentials of Anaesthetic Equipment