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A vapor is said to be saturated when?

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A vapor is said to be saturated when?

A.

a dynamic equilibrium exists between liquid molecules and the vapour molecules

B.

a dynamic equilibrium exists such that more molecules return to the liquid than are leaving it

C.

the temperature of the vapour varies

D.

the vapour pressure is atmospheric

Correct answer is A

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.