An air bubble of radius 0.2 mm is situated just below the water surface. Calculate the
gauge pressure. Surface tension of water is 7.2 ×10-2N/m.
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Given: Radius of bubble = 0.2mm or 0.2×(10) −3Nm
Surface tension of water = 7.2×(10) −2 N/m
We know that, excess pressure inside a air bubble in a liquid is given by
Where,
t = surface tension of liquid
r = radius of bubble
Thus,
Excess pressure =
0.2×(10) −3/2×7.2×(10) −2
=
2× 72/2×(10) −1
=72×(10) 1
=720n/m
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