→ The process of conversion of a substance from the liquid state to the gaseous state at any temperature below its boiling point is called evaporation or vaporisation.

→ Evaporation is a surface phenomenon.

• Factors affecting the rate of evaporation

Surface Area The rate of evaporation increases on increasing the surface area of the liquid.

Temperature -  The rate of evaporation increases with an increase in temperature.

Humidity - Decrease in the humidity increases the rate of evaporation.

Wind Speed - An increase in the wind speed increases the rate of evaporation.

• Evaporation causes cooling

→ The particles of liquid absorb energy from the surrounding to regain the energy lost during

evaporation. This absorption of energy from the surroundings make the surroundings cold.

→ Lately, scientists are talking about five states of matter or five phases of matter. These are-so

liquids, gases, plasmas and the Bose–Einstein condensate.