Question

define perspiration and why we are able to take a sip of hot tea in a suacer rather than a cup

Answer 1

Perspiration in simple term means sweating.
We are able to take a sip of hot tea in saucer rather than a cup because the saucer provides a larger surface area for evaporation than cup
Please Note that the rate of evaporation increases with increase in surface area.
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Answer 2

Because in a saucer, the surface is broad comparing to cup and here rate of evaporation is greater. Hence we are able to sip hot tea or milk faster from a saucer rather than a cup.