What happens in the capillary rise of a liquid, when the radius of the capillary tube increases?
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If 'r' is the radius of the bore of the capillary tube, the length along which the force of surface tension acts is 2πr. Hence total upward force is 2πr T cos θ. Due to this force the liquid rise up in the tube. ... The liquid goes on rising till the force of surface tension is balanced by the weight of the liquid column.
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This explains the rise in the liquid layer in the capillary tube. If 'r' is the radius of the bore of the capillary tube, the length along which the force of surface tension acts is 2πr. Hence total upward force is 2πr T cos θ. Due to this force the liquid rise up in the tube.
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