The excess pressure inside a soap bubble is thrice the excess pressure inside a second soap bubble. The ratio between the volume of the first and the second bubble is:

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P 1 ​ − P 0 ​ = r 1 ​ 4 T ​ P 2 ​ − P 0 ​ = r 2 ​ 4 T ​ ​ P 1 ​ − P 0 ​ = 3 ( P 2 ​ − P 0 ​ ) r 1 ​ 4 T ​ = 3 r 2 ​ 4 T ​ r 2 ​ = 3 r 1 ​ V 2 ​ V 1 ​ ​ = 3 4 ​ π r 2 3 ​ 3 4 ​ π r 1 3 ​ ​ = 27 1 ​ ​

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