Question

Evaporation is considered to be a ___ and can take place at ___

• A. Bulk phenomenon, room temperature
• B. Surface phenomenon, all temperature
• C. Surface phenomenon, boiling point
• D. Bulk phenomenon, freezing temperature

Answer 1

The correct option is B

Surface phenomenon, all temperature

Surface phenomenon, all temperature

Evaporation is considered as the surface phenomenon because the particles of water present at the surface take part in the process of evaporation. The water particles at the surface escape into vapour phase at any temperature below the boiling point of liquid.

This is possible because liquid present on the surface of water are bonded weakly as compared to inner molecules and when temperature increases the hydrogen bonding between water molecules breaks triggering ther process.