It means the air is fully saturated with water. This is very similar to when you have a glass of tea and you’re dissolving sugar in it, there is a point where if you add any more sugar, the sugar will just sit on the bottom and not dissolve into the tea. This is the saturation point and it occurs when water vapor is dissolving in air as well. once the air reaches 100% humidity, it has reached it saturation point.
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