A soap bubble is blown slowly at the end of a tube by a pump supplying air at a constant rate. Draw a graph to represent the variation between the excess pressure inside the bubble with time.
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Excess pressure inside a soap bubble is 4T/R. Since air is blown at constant rate dV/dt is known. From rate change of volume calculate rate change of radius. Hence you get excess pressure in terms of time by putting R as f(t) in the formula.