Q39 of 160 Page 36

Define ‘melting point’ of a substance? What is the melting point of ice?

The temperature at which a solid melts to become a liquid at the atmospheric pressure is called its melting point. The melting point of ice is 273.16 K.


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37

What is the physical state of water:

(a) at 0°C? (b) at 25°C


(c) at 100°C (d) at 250°C

 38

Explain why, there is no rise in temperature of a substance when it undergoes a change of state though heat is supplied continuously.

 40

Define ‘boiling point’ of a substance? What is the boiling point of water?

 41

Define the following terms:

(a) Melting (b) Boiling