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JAMB Physics 2011 Question 20

Question 20

Change of State and Vapours

Steam burn is more severe than that of boiling water because

  1. A.water boils at a higher temperature
  2. B.steam burn is dependent on relative humidity
  3. C.steam burn is independent of relative humidity
  4. D.steam possesses greater heat energy per unit mass.
Show the answer and explanation

Answer: D (steam possesses greater heat energy per unit mass.)

Explanation

Steam at 100°C gives out its large latent heat of vaporisation as it condenses on the skin, on top of the heat boiling water would give, so it burns more.