Formation of vapours from the surface of a liquid is called________________?
Correct answer: B. evaporation
- A. vapourization
- B. evaporation
- C. condensation
- D. cracking
Explanation
Evaporation is the escape of molecules from the surface of a liquid into the vapour phase, and it can occur below the boiling point. Students may choose vaporization, option a, because it is a broad term for liquid-to-gas change, but the surface-only process is specifically called evaporation.
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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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