Q40 of 160 Page 36

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

The temperature at which a liquid starts boiling at the atmospheric pressure is known as its boiling point. The boiling point of water is 373 K.

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38

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

 39

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

 41

Define the following terms:

(a) Melting (b) Boiling

 42

Define the following terms:

(a) Condensation (b) Freezing