Question

Why are we able to sip hot tea or milk faster from a saucer rather a cup

Answer 1

this is because the rate of evaporation is faster with the increase of the surface area.
that's why we are able to sip hot tea or Mike faster from saucer rather a cup.

MORE THE SURFACE AREA FASTER WILL BE THE EVAPORATION

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).