Question

your friend is asked to differenciate between evaporation and boiling

Answer 1

      Evopration                                                           Boiling
⇒Evaporation takes place at all                         ⇒  boiling occurs at a
   temperatures                                                      particular temperature
⇒ occur using the internal                                ⇒  requires an external source
    energy of the system                                        of heat.
⇒takes place from the surface                         ⇒ the entire liquid boils.
⇒ produces cooling effect                                ⇒ does not produce cooling                                                                                    effect.
⇒ slow process                                               ⇒  it is a rapid process.

Answer 2

BOILING-1.A process in which a substance changes its state
from the liquid state to the gaseous state
2.Bubbles are formed
3.Occurs throughout the liquid
4.Occurs at a definite temperature – Boiling point
5. Source of energy needed
EVAPORATION-1.A process in which a substance changes its state from
the liquid state to the gaseous state without boiling
2.No bubbles formed
3.Takes place only from the exposed surface of the liquid
4.Occurs at all temperature
5.Energy supplied by surroundings