what does 100% humidity mean?

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What’s the ratio of air to water at that percent? Is there a cap on the amount of moisture in the air? Is it the same for different elevations?

In: Earth Science

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> What’s the ratio of air to water at that percent?

That depends on the temperature. At the freezing point of water (0°C), air at 100% humidity has about half a percent of water by weight, while on a hot day (30°C), air at 100% humidity has about 3% water.

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