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The surface tension and vapour pressure ...

The surface tension and vapour pressure of water at `20^(@)C` is `7.28xx10^(-2)Nm^(-1)` and `2.33xx10^(3)Pa`, respectively. What is the radius of the smalalest spherical water droplet which can form without evaporating at `20^(@)C`?

A

`3.125xx10^(-5)m`

B

`12.5xx10^(-5)m`

C

`6.25xx10^(-5)m`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
C
The excess pressure `(2T//r)` should be greater than the vapour pressure. Then the drop will evaporate Vapour pressure `=` Excess pressure in drop.
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