Question
A soap bubble and a liquid drop both have same surface
tension and radius, then which will have more excess pressure inside it?Solution
• Excess pressure inside a liquid drop: P=2TrP = \frac{2T}{r}P=r2T • Excess pressure inside a soap bubble (because it has two surfaces): P=4TrP = \frac{4T}{r}P=r4T • Soap bubbles have more excess pressure than liquid drops of the same radius and surface tension
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