Question

Two soap bubbles have different radii but their surface tension is the same. Mark the correct statement

• A. Internal pressure of the smaller bubble is higher than the internal pressure of the larger bubble
• B. Pressure of the larger bubble is higher than the smaller bubble
• C. Both bubbles have the same internal pressure
• D. None of the above

Answer 1

Answer: (A)

Internal pressure of the smaller bubble is higher than the internal pressure of the larger bubble

Answer 2

$\Delta P = \frac { 4 T } { R }$ ∴$\Delta P \propto \frac { 1 } { R }$ (T = constant)

Hence, the internal pressure of smaller bubble is larger than that of larger bubble.