Question

water rises in a capillary tube but Mercury falls in the same tube. Why?

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Answer 1

Answer:

formula for capillary rise =

$h \: = \frac{2tcos \cos \theta}{r \: rho \: g}$

h = hieght of water in capillary tube

Cos theta = angle of contact

t = surface tension

r = radius of capillary tube

rho = density of liquid

$h \: \alpha \:\cos \: theta$

Capillary tube is made up of glass and

for water and glass angle of contact is less than 90°

so, cos theta = positive

So , capillary rise occurs.

But for Mercury and glass angle of contact is more than 90°

So, cos theta = negative

So, capillary depression occurs and mercury falls in the same tube.

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