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JAMB Physics 1979 Question 22

Question 22

Pressure

Which of the following statements is correct? The reading of pressure on a mercury barometer is independent of

  1. A.the cross-sectional area of the tube
  2. B.the atmospheric pressure
  3. C.the density of mercury
  4. D.the temperature of mercury
  5. E.the acceleration due to gravity.
Show the answer and explanation

Answer: A (the cross-sectional area of the tube)

Explanation

Pressure depends on the height of the column (p = hρg), not on how wide the tube is.