Question

What is evaporation?

(a) Process of substance in a liquid state changing to a gaseous state

(b) Process of substance in a solid state changing to a gaseous state

(c) Process of substance in a liquid state changing to a solid state

(d) Process of substance in a gaseous state changing to a liquid state

The question was posed to me by my college director while I was bunking the class.

Enquiry is from Heat Transfer in Evaporators topic in section Evaporation of Food Processing Unit Operations

Answer 1

The correct option is (a) Process of substance in a liquid state changing to a gaseous state

To elaborate: Evaporation is the process of a substance in a liquid state changing to a gaseous state due to an increase in temperature and pressure.When the molecules of the liquid collide, they transfer energy to each other.