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Fluid Mechanics: Surface Tension MCQ

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Surface TensionMediumQuestion 30945

Question

Excess pressure inside a liquid drop (radius r, surface tension T) is:
  1. A
    T/r
  2. B
    2T/r
    Correct
  3. C
    4T/r
  4. D
    T/(2r)

Correct answer

2T/r

Explanation

A liquid drop has ONE surface. Excess pressure ΔP = 2T/r. (Soap bubble has two surfaces: ΔP = 4T/r.)

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