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GK QUESTION#3365

Why do tiny drops of water appear on the outside of a glass filled with chilled water?

  1. AThe glass releases water from its surface.
  2. BWater vapour present in the air condenses when it touches the cold surface of the glass.Correct answer
  3. CThe cold water pushes liquid through the glass walls.
  4. DThe surrounding air turns into steam near the glass.
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Answer

B. Water vapour present in the air condenses when it touches the cold surface of the glass.

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Explanation

Air contains water vapour. If the outside glass surface is cold enough to cool nearby air below its dew point, some vapour condenses into liquid droplets. The water comes from the air rather than passing through the glass.

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