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Why does the mercury fall in a capillary...

Why does the mercury fall in a capillary tube ?

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Height of liquid in capillary `h=(2scostheta)/(rrgog)`
The angle of contact of glass and mercury `thetagt90^(@)` , hence `costheta` is negative .So ,mercury falls in a capillary .
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KUMAR PRAKASHAN-MECHANICAL PROPERTIES OF FLUIDS -SECTION -C (Objective Questions) (VSQs)
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  8. Why does the water rise in a capillary tube Explain .

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  9. Why does the mercury fall in a capillary tube ?

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  10. A 20 cm long capillary tube is dipped in water The water rises upto 8 ...

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