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Mercury has an angle of contact equal to...

Mercury has an angle of contact equal to `140^@` with soda lime glass. A narrow tube of radius 1.00mm made of this glass is dipped in a trough containing mercury.By what amount does the mercury at the temperature of the experiment is 0.465 `Nm^-1`. Density of mercury =`13.6 times 10^3 kg m^-3`

Text Solution

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Radius of tube, r = 1.00 mm = `10^(-3)m`, Surface tension of mercury, `alpha=0.465Nm^(-1)`
Angle of contact, `theta=140^(@)thereforeh=(2sigmacostheta)/(rrhog)=-5.24xx10^(-3)m=-5.24mm`
Negative sign shows that the mercury level is depressed in the tube.
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