**·**2011-03-11 08:08:16

We have (see figure)

p_{1} - p_{3} = 2SR_{1} and

p_{2} - p_{4} = 2SR_{2}

Also, p_{3} = p_{4} = p_{atm} and

p_{2} = p_{1} + Ïgh

So we get

Ïgh = 2S (1R_{2} - 1R_{1})

which gives the difference in curvatures as

R_{1} - R_{2} = ÏghR_{1}R_{2}2S