13.2 Soapy water has a surface tension of 0.025 N m-. A small bubble initially of radius r¡ = 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 AP ? The bubble expands to a radius of 12 = 4 mm. (b) What is the gauge pressure inside the bubble now AP2? (c) what is the ratio of the gauge pres- sures AP2

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