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Relative humidity
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A table showing relative humidity values dry-bulb temperature values on the y-axis and the difference between the dry-bulb and wet-bulb temperatures on the x-axis.
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What Is Relative Humidity?
Humidity
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Relative humidity

meteorology
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Relative humidity, ratio of the actual vapour pressure of water in the air to that in air saturated with water vapour; it is often expressed as a percentage. See humidity.