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  4. The surface tension of a soap solution is 25 × 10-3 N/m. The excess pressure inside a soap bubble of diameter 1 cm is

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Q. The surface tension of a soap solution is $25 \times 10^{-3}\,N/m$. The excess pressure inside a soap bubble of diameter 1 cm is

Mechanical Properties of Fluids

Solution:

$\Delta P = \frac{4T}{r}$