passwella.
Menu

JAMB Physics 1995 Question 25

Question 25

Change of State and Vapours

Which of the following statements give the TRUE differences between evaporation and boiling?
I. Evaporation occurs at all temperatures while boiling occurs at a fixed temperature for a given pressure
II. Evaporation is a surface phenomenon while boiling is an interior phenomenon
III. Evaporation is affected by surface area while boiling is not

  1. A.I and II only
  2. B.I and III only
  3. C.II and III only
  4. D.I, II and III
Show the answer and explanation

Answer: D (I, II and III)

Explanation

All three are true: evaporation happens at any temperature, only at the surface, and faster with a larger surface; boiling happens at one temperature (for a given pressure) throughout the liquid.