Question

There are two liquid drops of different radii. The excess pressure inside over the outside is:-

• A. more in the big drop
• B. more in the small drop
• C. equal in both drops
• D. there is no excess pressure inside the drops

Answer 1

Answer: (B)

more in the small drop

The excess pressure inside a drop is always more than that on the outside.

and this excess pressure is given by, $\delta P=\frac{2T}{R}$

Therefore, $\delta P\propto R^{-1}$

Hence, the drop with a smaller radius will have a higher excess pressure inside the drop.