Soapy water has a surface tension of 0:025 N m-1. A small bubble initially of radius ?1 = 2 mm is formed. The air pressure in the vicinity of the bubble is 100 kPa. (a) What is the gauge pressure inside the bubble now Δ?2? The bubble expands to a radius of ?2 = 4 mm. (b) What is the ratio of the gauge pressures Δ?1/Δ?2? (c) What is the ratio of the bubble diameters ?1/? 2?

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