Question: Explain the difference between a bubble and a cavity. Calculate the vapour pressure of a spherical drop of water of radius 10 nm at 20oC.

Explain the difference between a bubble and a cavity. Calculate the vapour pressure of a spherical drop of water of radius 10 nm at 20oC. The surface tension of water is 72.75 x 103 N m1 , the vapour pressure of bulk water at 20oC is 2.3 kPa and the density of water is 0.998 g cm3 .

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