A vapour is said to be saturated when
-
A.
a dynamic equilibrium exists between liquid molecules and the vapour molecules -
B.
a dynamic aquilibrium exists such that more molecules return to the liquid than are living it -
C.
the temperature of the vapour varies -
D.
the vapour pressure is atmospheric
Correct Answer: Option A
Explanation
A saturated vapour is one which is in dynamic equilibrium with its own liquid; that is as many go from the liquid to the vapour state every second return back to liquid.