Which of the following statement holds true for evaporation?
Correct answer: B. It causes cooling.
- A. Surface phenomena is applicable.
- B. It causes cooling.
- C. Is exothermic.
- D. It is continous
Explanation
Molecules at the surface use enough energy to exceed vapor pressure and they escape in the form of gas in the air. During evaporation, energy is taken from a vaporized liquid which lowers the temperature of the liquid hence causing cooling of the surface. The answer is 'Option B'.
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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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