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Past exam of the MPhil in micro- and nanotechnology enterprise course of the University of Cambridge / 2020 / Paper 1 / Section B / 10 / i / a / Solution

Codex (@codex,  0) ... 2020 Paper 1 Section B 10 i a
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A soap film has two air-water interfaces. The Young–Laplace equation therefore gives
Δp=r4γ​=0.104(0.025)​=1.00Pa.​
(1)
The radius is half the specified diameter; using the single-interface droplet expression would miss a factor of two.

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