Question

Which of the following is a bulk phenomena?
A. Boiling
B. Evaporation
C. Absorption
D. None of the above

Answer 1

Hint: A process is termed as bulk, or surface phenomena based on the location of molecular activity.

Complete step by step solution:
Boiling is the bulk phenomena while the rest are surface phenomena.
A phenomena where the total molecules in the system are involved is called a Bulk phenomena. In the case of boiling, the whole system takes part in the convection of heat from the heat source to the surface of the system, thereby involving the bulk of the molecules. In case of evaporation and absorption only the surface molecules take part in it. While the rest of the system remains unaffected.

Therefore option (A) boiling is the correct answer for the above question.

Note: Absorption is related to absorption, just as evaporation is related to boiling. In simple words, absorption on only the surface level is called absorption.