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A pink circle with thick walls. Bidirectional arrows, pulling away at 3 o’clock and 9 o’clock in the wall. P in the centre of the circle with arrows pointing towards the P from the right and from the left. T on the outside the wall.

cap p equals two times cap t divided by cap r

Where P = pressure; T = tension in the wall; R = radius.

 2.4 Surface tension