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Find the difference in height of mercury...

Find the difference in height of mercury columns in two communicating vertical capillaries whose diameters are `d_1 = 0.50 mm` and `d_2 = 1.00 mm`, if the constant angle `theta = 138^@`.

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`Delta h rho g = 4 alpha|cos theta|((1)/(d_1) -(1)/(d_2))`
`Delta h = (4 alpha|cos theta|(d_2 - d_1))/(d_1 d_2 rho g) = 11 mm`.
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