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JAMB Physics 2014 Question 25

Question 25

Heat Transfer

Heat transfer by convection in a liquid is due to the

  1. A.increased vibration of the molecules of the liquid about their mean position.
  2. B.variation of density of the liquid.
  3. C.expansion of the liquid as it is heated.
  4. D.latent heat of vaporization of the liquid.
Show the answer and explanation

Answer: B (variation of density of the liquid.)

Explanation

Heated liquid becomes less dense and rises, while cooler, denser liquid sinks to take its place. These density differences drive convection currents.