Q8 of 19 Page 13

Why do we prefer to sip hot tea with a saucer rather than a cup?

The rate of vaporization increases with an increase in surface area. Saucer has higher surface area so it is easy to sip hot tea with saucer. So there will be more hot particles form into vapor and cool down the tea. In the cup due to less surface area less hot particles will be at the surface, so there will be less hot particles convert into vapor and cool down of tea will take more time.


More from this chapter

All 19 →
6

Define the following terms:

a) melting point


b) boiling point


c) evaporation

 7

Correct the following statements.

a) Water boils at 100°C under atmospheric pressure. 14 Matter Around us


b) a liquid evaporates above its boiling point


c) solids have the largest inter-particle space.


d) gases have the strongest inter-particle forces.

 9

When water solidifies to ice then heat is

a) Liberated


b) Absorbed


c) No change


d) Depending on the condition heat may absorbed or liberated.

 10

Convert the following temperatures to the Celsius scale.

(a) 283k


(b) 570k