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The name for this is relative humidity.

It is most often measured by a "wet and dry thermometer". This is just two thermometers, one of which is kept wet by a cloth wick dipping into a small pot of water. The other is, well, dry. The dry one indicates the air temperature. The wet one shows the same temperature minus the cooling effect of the water evaporating around the wet bulb. The higher the relative humidity, the less the evaporation and the smaller the difference in temperature. These thermometers are sold witha set of tables that calculate the R.H. from the two temperatures.

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14y ago
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1mo ago

Relative humidity tells us how close air is to saturation. It is expressed as a percentage and is a measure of the amount of water vapor in the air compared to the maximum amount the air can hold at a specific temperature. High relative humidity indicates that air is close to being saturated with moisture.

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Q: What tells us how close air is to saturation?
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