Question

Define.

(a) Melting point

(b) Boiling point

(c) Specific heat

(d) Calorie

Answer 1

(a) Melting point

The minimum temperature at which a substance starts melting and becomes a liquid at atmospheric pressure is known as its melting point. The melting point of ice is 0⁰C.

(b) Boiling point

The minimum temperature at which a liquid substance starts boiling and becomes gas at atmospheric pressure is known as its boiling point. The boiling point of water is 100⁰C.

(c) Specific heat

The amount of heat required to raise the temperature of 1 kg of a substance by 1⁰C is called specific heat of the substance. Its SI unit is Cal/(kg ⁰C).

(d) Calorie

One calorie of heat is the amount required to raise the temperature of 1 kg of water by 1⁰C (from 14.5⁰C to 15.5⁰C).