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Mercury in a capillary tube is depressed...

Mercury in a capillary tube is depressed by 1.16cm. The diameter of the capillary tube is 1mm. Calculate the angle of contact of mercury with the glass if the surface tension of mercury is `54 xx 10Nm^(-1)` and its density is `13.6 xx 10^(3) kg m^(-3)`.

Text Solution

Verified by Experts

The correct Answer is:
`9.4 xx 10^9-4) m`
`r = 2 sigma cos theta // h rho g = 2 xx 54 xx 10^(-2) xx ( - 0.766 ) //( - 1.32 xx 10^(-2)) xx ( 13.6 xx 10^(3) xx 9.8 = 4.7 xx 10^(-4)) m`.
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