Steam causes more sever burn than the boiling water because it possesses _________________?
Correct answer: B. Latent heat of vaporization
- A. Latent heat of fusion
- B. Latent heat of vaporization
- C. Latent heat of sublimation
- D. All of the above
Explanation
Steam contains the latent heat of vaporization absorbed when liquid water changed into vapour, in addition to its sensible heat; releasing this heat on condensation causes a more severe burn. Students may choose latent heat of fusion because it is also a phase-change energy, but fusion concerns melting, not liquid-to-vapour conversion.
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About Evaporation, Boiling Point and Vapour Pressure
Evaporation is the escape of higher-energy molecules from a liquid surface, while vapour pressure is the pressure exerted by vapour in equilibrium with that liquid. The topic distinguishes evaporation from boiling and relates both to temperature, intermolecular forces, surface area, atmospheric pressure and the boiling point.
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