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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

      тАв Excess pressure inside a liquid drop: P=2TrP = \frac{2T}{r}P=r2T тАв Excess pressure inside a soap bubble (because it has two surfaces): P=4TrP = \frac{4T}{r}P=r4T тАв Soap bubbles have more excess pressure than liquid drops of the same radius and surface tension

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