A cylinder with a movable piston contains air under a pressure P_1 and a soap bubble of radius 'r'. The pressure P_2 to which the air should be compressed by slowly pushing the piston into the cylinder for the soap bubble to reduce its radius by half will be : x[P_1 +3S//r], where S is the surface tension

A cylinder with a movable piston contains air under a pressure P_1 and

1.	A cylinder with a movable piston contains air under a pressure P_1 and a soap bubble of radius 'r'. The pressure P_2 to which the air should be compressed by slowly pushing the piston into the cylinder for the soap bubble to reduce its radius by half will be : x[P_1 +3S//r], where S is the surface tension
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