First slide

Surface tension and surface energy

Question

If the surface tension of water is 0.06 Nm^-1, then the capillary rise in a tube of diameter 1 mm is ( $θ$ =0° and g = 10 ms^-2 )

Moderate

A

1.22 cm
B

2.4 cm
C

3.12 cm
D

3.86 cm

Solution

$h = \frac{2 T}{rdg} = \frac{2 \times 6 \times 10^{- 2}}{5 \times 10^{- 4} \times 10^{3} \times 10} = 2 .4 \times 10^{- 2} m = 2 .4 cm$

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