Question

If a fluid of certain surface tension and diameter is used to create a soap bubble and a liquid jet. Which of the two, bubble or liquid jet, will have greater pressure difference on the inside and outside.

(a) Liquid jet

(b) Soap bubble

(c) Both will have same pressure differrence

(d) None of the mentioned

This question was addressed to me in my homework.

My enquiry is from Surface Tension, Capillarity, Vapour Pressure and Cavitation in portion Properties of Fluids of Fluid Mechanics

Answer 1

Correct answer is (b) Soap bubble

To elaborate: For soap bubble,

                     P=8*σ/d

                     For liquid jet,

                     P=2*σ/d

                     Hence, soap bubble will be having more pressure difference.