First slide

Surface tension and surface energy

Question

A spherical drop of water has radius 1 mm If surface tension of water is $70 \times 10^{- 3}$ N/m. Difference of pressures between inside and out side of the spherical drop is

Moderate

A

$35 N / m^{- 2}$
B

$70 N / m^{2}$
C

$140 N / m^{2}$
D

Zero

Solution

$ΔP = \frac{2 T}{R} = \frac{2 \times 70 \times 10^{- 3}}{1 \times 10^{- 3}} = 140 N / m^{2}$

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