Eli5 how humidity is calculated

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What does it mean by 100% humid? 80% Can you have 0%?

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humidity is a measurement of how much water is in the air. Once it reaches 100%, then the air is ‘saturated’. Meaning if you try to add any more water, then it’ll just form droplets that simply fall to the ground.

Naturally, 0% humidity is also possible. That just means there is no water in the air.