+1 vote
in Fluid Mechanics by (118k points)
What will be the diameter (in mm) of a water droplet, the pressure inside which is 0.05 N/cm^2 greater than the outside pressure? (Take surface tension as 0.075 N/m)

(a) 3

(b) 0.3

(c) 0.6

(d) 6

This question was posed to me in a job interview.

My question is taken from Surface Tension in section Properties of Fluids of Fluid Mechanics

1 Answer

+2 votes
by (362k points)
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Best answer
The correct option is (c) 0.6

Best explanation: p = 4σ/d

where p = pressure difference between the liquid droplet and the surrounding medium, σ = surface tension and d = diameter of the droplet. Substituting all the values,

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