Which will evaporate faster; hot water in a cup or cold water in a cup?
Correct answer: B. Hot water
- A. Cold water
- B. Hot water
- C. Both evaporate at the same rate
- D. Both evaporate slowly
Explanation
Hot water evaporates faster than cold water because, at higher temperatures, more molecules are moving faster; therefore, it is more likely for a molecule to have enough energy to break away from the liquid to become a gas. The particles have more kinetic energy thus they can escape from the surface more easily.
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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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