Question

is evaporation surface phenomina or bulk phenomina

Answer 1

Evaporation is a Surface phenomenon whereas, Boiling is a Bulk phenomenon.

Evaporation is a Surface phenomenon, and can cause Vaporisation only at the surface. which means that only the particles or molecules of the liquids present on its surface change into vapours . Thus, greater the surface area of the liquid more will be the rate of Evaporation .

For example :- we often spread wet clothes in order to dry them in air. By doing so, there is again an increase in surface area available for the Evaporation of water. the clothes soon gets dry.

Answer 2

Evaporation is nothing but the the change of state from liquid to vapour at a temperature below boiling point. it is a surface phenomenon