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Due to surface tension of water the component T cos @ acting all along the circumference of the capillary tube 2 pi r would get added as 2 pi r T cos@. Here @ is the angle of contact of water with the material of the tube ie glass.

Hence this uplifts the water to a height till its weight gets balanced by 2 pi r T cos@.

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12y ago
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11y ago

It is our common observation that the liquid always rises in a capillary tube , the effect is referred to as the " CAPILLARY ACTION ".capillary action of liquid is also due to their surface tension. the surface area to volume ration of a capillary of small bore is much smaller than the container in which liquid is placed. Like viscosity , the surface tension of a liquid also decreases with the rise of temperature owing to the weakening of the inter molecular attractions .

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Q: How water rises in capillary tubes?
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