First slide

Surface tension and surface energy

Question

A long cylindrical glass vessel has a small hole of radius 'r' at its bottom. The depth to which the vessel can be lowered vertically in the deep water bath (surface tension T) without any water entering inside is

Moderate

A

$4 T / ρ r g$
B

$3 T / ρ r g$
C

$2 T / ρ r g$
D

$T / ρ r g$

Solution

$h d g = \frac{2 T}{r} \Rightarrow h = \frac{2 T}{r d g}$

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