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CGP EDU Academic Team
Published on: September 12, 2026
The pressure of air in a soap bubble of 0.7cm diameter is 8 mm of water above the pressure outside. The surface tension of the soap solution is
Text Solution
Verified by ExpertsThe correct answer is:
B
$\Delta P = \frac{4T}{r} = hdg \implies T = \frac{rhdg}{4}$ $\frac{0.35 \times 0.8 \times 1 \times 10^{3}}{4}$
$= 70 \text{ dyne/cm}$ = 68.66 dyne/cm
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