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Why coffee runs up into a sugar lump (a ...

Why coffee runs up into a sugar lump (a small cube of sugar) when one corner of the sugar lump is held in the liquid?

Text Solution

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(i) If sugar cube is dropped into liquid the outermost layer has to dissolve first, then next layer, then until the whole sugar is dissolved.
(ii) The coffee runs up into pores of sugar lump due to capillary action of the liquid.
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