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JAMB Physics 2002 Question 20

Question 20

Change of State and Vapours

Blowing air over a liquid aids evaporation by

  1. A.increasing its temperature
  2. B.increasing its surface area
  3. C.decreasing its density
  4. D.decreasing its vapour pressure.
Show the answer and explanation

Answer: D (decreasing its vapour pressure.)

Explanation

Moving air carries away the vapour above the liquid, lowering the vapour pressure there so more molecules can escape.