1.

An air bubble of radius r in water is at a depth of h below the water surface at some instant. If P is atmospheric pressure and d and T are the density and surface tension of ater respectively. Calculate the pressure P inside the bubble?

Answer»

Excess ot pressure inside the air bubble in water = \(\frac{2T}{r}\)

∴ Total pressure inside the air bubble

= atmospheric pressure + pressure due to liquid column + Excess pressure due to surface tension

= p + hρg + \(\frac{2T}{r}\)



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