You can identify if the air is saturated or unsaturated based on the amount of water vapours found in the air. In case the quantity of water vapour is more than what the air can hold, then it is saturated. If the amount exceeds this limit, the excess vapor converts into water droplets. If air temperature is low, it will need less vapor to saturate the air. Same way, if the amount of water vapour is less than the limit that the air can contain, then it is unsaturated. It is also possible to determine if the air is saturated or not in terms of relative humidity. That is, if the relative humidity is 100%,then the air is saturated and otherwise it is unsaturated.
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