Question

If the dimension of liquid drop and bubble of same liquid solution is same, then find the ratio of excess pressure inside liquid drop to the excess pressure inside bubble?

• A. $2:1$
• B. $1:2$
• C. $3:2$
• D. $2:3$

Answer 1

The correct option is B $1:2$

We know,
Excess pressure inside a liquid drop
$\Delta P_l=\frac{2T}{R}$
and
Excess pressure inside a bubble
$\Delta P_b=\frac{4T}{R}$
$\therefore \frac{\Delta P_l}{\Delta P_b}=\frac{\frac{2T}{R}}{\frac{4T}{R}}=\frac{1}{2}$