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Phenomena on Liquid Surfaces. Help Me Solve This Question?
What work is required to blow a soap bubble 10cm in diameter at 20 Degree Celcius? (Surface Tension = 0.04Jm^-2)
1 Answer
- Andrew SmithLv 71 decade agoFavorite Answer
Assuming that the original area of the soap was negligible then the work done is the area of the bubble multiplied by the surface tension.
The bubble would be a sphere of radius 0.05 m
and its area would be 4 pi() r^2
So the work as far as surface tension would be = 0.04 * 4 * pi() * 0.05 ^2
= 0.0013 J
There could be some work involved in compressing the air but this should be negligible relatively.
