In an experiment to find the surface tension | vedclass

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(B) The behavior of a liquid in a capillary tube depends on the angle of contact $	heta$ between the liquid and the solid surface of the tube.For liq

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depress below the level of the liquid in the container

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(B) The behavior of a liquid in a capillary tube depends on the angle of contact $	heta$ between the liquid and the solid surface of the tube.For liquids that wet the surface (e.g.,water),the angle of contact is acute $(	heta For liquids that do not wet the surface (e.g.,mercury),the angle of contact is obtuse $(	heta > 90^{\circ})$.Since mercury has an obtuse angle of contact with glass,the cohesive forces between mercury molecules are stronger than the adhesive forces between mercury and glass.Consequently,the mercury level in the capillary tube will be lower than the level of the mercury in the container,which is known as capillary depression.

In an experiment to find the surface tension of mercury with the help of the capillary rise method,the liquid column in the capillary will:

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$A$ vertical capillary tube is filled with water up to the top after closing its lower end with a finger. If the finger is removed,we shall observe that: ($T = 70 \,\, dyne/cm$,radius of capillary $r = 1 \,\, mm$ and $g = 980 \,\, cm/sec^2$)

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$A$ capillary tube is vertically immersed in water,and water rises up to a height $h_{1}$. When the whole arrangement is taken to a depth $d$ in a mine,the water level rises up to a height $h_{2}$. The ratio $h_{1} / h_{2}$ is ($R =$ radius of earth).

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