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

Answer

A hot cup of tea or milk gets cooler due to evaporation. 

We know that evaporation depends upon the surface area. 

The more surface area , the faster is the rate of evaporation. 

Since the surface area is more when tea/milk is in the saucer as compared to that when tea/milk is in the cup, the rate of evaporation is faster in a saucer. 

Hence, we are able to sip hot tea or milk faster from a saucer rather than a cup.

ExposedSurfaceArea.png

  1. Class 9
  2. Chapter 1 Class 9 - Matter In Our Surroundings

About the Author

Davneet Singh's photo - Teacher, Computer Engineer, Marketer
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.