Coversion of liquid to vapours is called:
Correct answer: C. Evaporation
- A. boiling
- B. Freezing
- C. Evaporation
- D. Condensation
Explanation
This spontaneous change of a liquid into its vapours is called evaporation and it continues at all temperatures. Evaporation causes cooling. The reason is that when high energy molecules leave the liquid and low energy molecules are left behind, the temperature of the liquid falls and heat moves from the surrounding to the liquid and then the temperature of the surrounding also falls.
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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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