First slide

Surface tension

Question

If water has a surface tension of $7 \times 10^{- 2} N / m^{2}$ and an angle of contact with glass is zero, it rises in a capillary of diameter 0. 5mm to a height

Moderate

A

70 cm
B

7.0 cm
C

6.2 cm
D

5.6 cm

Solution

$h = \frac{2 T c o s θ}{r ρ g} = \frac{2 \times (7 \times 10^{- 2}) c o s 0^{0}}{(\frac{0 \cdot 5}{2} \times 10^{- 3}) (10^{3}) (10)} metre = 56 \times 10^{- 3} m = 5 \cdot 6 c m$

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