First slide

Surface tension and surface energy

Question

Water rises to a height h in a capillary at the surface of earth. On the surface of the moon the height of water column in the same capillary will be

Moderate

A

6h
B

$\frac{1}{6} h$
C

h
D

zero

Solution

$h = \frac{2 Tcos θ}{rdg} ∴ h \propto \frac{1}{g}$
$As g_{m} = \frac{g_{e}}{6} ∴ h_{m} = 6 h_{e}$

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