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A capillary tube is dipped first in cold...

A capillary tube is dipped first in cold water and then in hot water. Comment on the capillary rise in the second case.

Text Solution

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We know that `h = (2s cos theta)/(r rho g)`
Surface tension of hot water is less than the surface tension of cold water. Moreover, due to thermal expansion the radius of the capillary tube will increase in hot water. Dur to both reasons, the height of capillary rise will be less in hot water as compared to cold water.
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