Question

Consider a 0.15 -mm-diameter air bubble in a liquid. Determine the pressure difference between the inside and outside of the air bubble if the surface tension at the air-liquid interface is

(a) 0.080 N / m and

(b) 0.12 N / m.

Solution

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We are given an air bubble with diameter:

D=0.15 mm\begin{aligned} D&=0.15\text{ mm} \end{aligned}

We are required to solve for the pressure difference ΔP\Delta P when:
(a)(a) σs=0.080 N/m\sigma_s=0.080\text{ N/m}
(b)(b) σs=0.12 N/m\sigma_s=0.12\text{ N/m}

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