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What does relative humidity measure?

the amount of water in cirrus clouds
the amount of water that has evaporated into the air
the amount of frozen water that has condensed from the air
the amount of water vapor in the air compared to the amount the air can hold

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Answered by GPT-5 mini AI
The amount of water vapor in the air compared to the amount the air can hold.

Relative humidity is the ratio (often given as a percentage) of the current water vapor in the air to the maximum water vapor the air could hold at that temperature.