how could air that is saturated with water become over saturated without adding any water
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It could be cooled which would then cause it to become supersaturated resulting in condensation that would return the air to a saturated state. Supersaturated air, with a humidity greater than 100%, is unstable, causing changes to restore stability.
An interesting effect of this was in Brisbane Australia one hot humid summer day when the temperature was above skin temperature and humidity was 100%. When the air touched my skin it cooled and water from the air condensed on my skin. A very strange feeling
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