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This question belongs to Mechanical Engineering Hydraulics And Fluid Mechanics In ME

Hydraulics and Fluid Mechanics in ME

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The difference of pressure between the inside and outside of a liquid drop is

A) $${\text{p}} = {\text{T}} \times {\text{r}}$$ B) $${\text{p}} = \frac{{\text{T}}}{{\text{r}}}$$ C) $${\text{p}} = \frac{{\text{T}}}{{2{\text{r}}}}$$ D) $${\text{p}} = \frac{{2{\text{T}}}}{{\text{r}}}$$

Answer & Solution

Correct Answer: Option D

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Sreenu Sreenu 5 years ago

If T is the surface tension of the liquid, the force due to surface tension acting downward along the circumference of the circle ABCD is T 2πr.
At equilibrium, Pπr 2 = T 2πr
P = 2T/r

Fajar Khan 6 years ago

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