Physics - Fluid Question with Solution | TestHub

The excess pressure inside a soap bubble is given by $\Delta P=\frac{4T}{R}$

where $T$ is the surface tension and $R$ is the radius of the bubble.

Given, $\Delta P=48$ dyne/cm${}^2$ and $R=2.5$ cm.

Substituting the values, we get:

$48=\frac{4T}{2.5}$

$T=\frac{48\times 2.5}{4}$

$T=12\times 2.5=30$ dyne/cm

Answer: $30$