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    Question

    A soap bubble and a liquid drop both have same surface

    tension and radius, then which will have more excess pressure inside it?
    A Soap bubble Correct Answer Incorrect Answer
    B Liquid drop Correct Answer Incorrect Answer
    C Both have same excess pressure Correct Answer Incorrect Answer
    D Can't say Correct Answer Incorrect Answer

    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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