Question

Change of a liquid into vapours at any temperature below its boiling point is called as
A.Solidification
B.Gasification
C.Evaporation
D.Liquefaction

Answer 1

Vaporization is the conversion of a substance from the liquid or solid phase into the gaseous (vapour) phase. This is done by a method in which a phase transition from the liquid phase to the gas phase occurs at temperatures below the boiling point at a given pressure.

Complete step by step answer:
Solidification which is also known as freezing, is a phase change of matter that results in the generation of a solid. This generally occurs when the temperature of the liquid is below its freezing point.
Gasification is a process that converts biomass or fossil fuel based carbonaceous matter into hydrogen, carbon dioxide and carbon monoxide.
Evaporation occurs on the surface of liquid as it turns into gaseous form before reaching boiling point. The surrounding gas must not be soaked with evaporating gas.
Liquefaction is a process that produces a liquid from a solid or a gas or that generates a non-liquid phase which acts in accordance with fluid dynamics. It happens both naturally and artificially.
Thus, in case of liquids, a large fraction of particles at the surface having higher kinetic energy, is able to split from the forces of attraction of other particles and changes into vapour. This change of a liquid into vapours at any temperature below its boiling point is called evaporation.

Therefore, the correct answer is option (C).

Note: An evaporation rate is the rate at which a material will vaporize (evaporate, change from liquid to vapour) compared to the rate of vaporization of a specific known material. This quantity is a ratio; therefore, it is without any unit.