Question

why are we able to sip hot tea or milk faster from a saucer rather than a cup?

Answer 1

Because larger the surface area of a container, the faster a hot liquid will cool down.
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Answer 2

Answer:

If the hot tea (or milk) is taken in a cup, then due to the narrow shape of the cup, the surface area of hot tea (or milk) in the cup is comparatively small. Because of small surface area, the evaporation of hot tea (or milk) taken in the cup is slow, cooling caused by evaporation is less, and hence the hot tea (or milk) remains appreciably hot for a much longer time, making it difficult to sip. On the other hand, saucer has a large surface area. Due to the large surface area of hot tea (or milk) taken in the saucer, the evaporation of hot tea (or milk) from the saucer is faster. The faster evaporation cools the hot tea (or milk) much more quickly making it convenient to sip (or drink).