Saturation is best defined as: A) a vapor pressure greater than 1000 mb. B) a mixing ratio of at least 100 g/kg. C) equal numbers of water molecules evaporating from and condensing into a water surface. D) the point when water molecules completely stop evaporating from a water surface.

Question

Quizplus · Accepted Answer

Saturation occurs when there is equilibrium between the amount of water molecules evaporating from a surface and the amount of water molecules condensing back onto that surface. This state is also known as 100% relative humidity. Choices A and B are incorrect because they do not accurately describe saturation. Choice D is incorrect because even at saturation, water molecules still evaporate from a water surface, they just condense back onto it at the same rate.

Saturation Is Best Defined As