Q. 294.2( 22 Votes )
Name A, B, C, D, E and F in the following diagram showing changes in state:
(i) In process A, a solid is changing into a liquid. Hence, A is melting or fusion.
The temperature at which a solid melts to become a liquid at the atmospheric pressure is called its melting point.
(ii) In process B, a liquid is changing into a gas. B is evaporation.The temperature at which a liquid starts boiling at the atmospheric pressure is known as its boiling point. Boiling is a bulk phenomenon. Particles from the bulk of the liquid gain enough energy to change into the vapour state.
(iii) In process C, a gas is changing into a liquid. C is condensation.
(iv) In process D, a liquid is changing into a solid. D is solidification.
(v) In process E, a solid is directly changing into a gas. E is sublimation which is done under increased heat and decreased pressure.
(vi) In process F, a gas is changing directly into a solid. F is also sublimation which is done under decreased heat and increased pressure.
The process of change of state of solid directly into a gas without changing into liquid state (or vice versa) is called sublimation.
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