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JAMB Physics 2008 Question 24

Question 24

Change of State and Vapours

If the partial pressure of water vapour at 27°C is 18mm Hg and the saturated vapour pressure of the atmosphere at the same temperature is 24 mm Hg, the relative humidity at this temperature is

  1. A.25%.
  2. B.33%.
  3. C.75%.
  4. D.82%.
Show the answer and explanation

Answer: C (75%.)

Explanation

Relative humidity = actual vapour pressure ÷ saturated vapour pressure × 100% = 18/24 × 100% = 75%.