First slide
Surface tension and surface energy
Question

The pressure inside a small air bubble of radius 0.1 mm situated just below the surface of water will be equal to 
[Take surface tension of water  70×103Nm1 and atmospheric pressure = 1.013×105Nm2 ]
 

Moderate
Solution

Excess pressure inside the air bubble =2Tr

Pin Pout =2Tr=2×70×1030.1×103=1400PaPin =1400+1.013×105=1.027×105Pa

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