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A capillary tube is dipped first in cold water and then in hot water. Comment on the capillary rise in the second case. |
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Answer» We know that h = 2Scosθ/rpg 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. Due to both reasons, the height of capillary rise will be less in hot water as compared to cold water. |
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