First slide

Surface tension and surface energy

Question

When a capillary is dipped in water, water rises 0.015 m in it. If the surface tension of water is 75×10^–3 N/m, the radius of capillary is

Moderate

A

0.1 mm
B

0.5 mm
C

1 mm
D

2 mm

Solution

$h = \frac{2 T}{rdg} \Rightarrow r = \frac{2 T}{hdg} = \frac{2 \times 75 \times 10^{- 3}}{15 \times 10^{- 3} \times 10^{3} \times 10} = 1 mm$

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