What is relative humidity and how is it measured?

Relative humidity is a measure of the amount of moisture in the air relative to the total amount of moisture the air can hold. For instance, if the relative humidity was 50%, then the air is only half saturated with moisture. Warmer air can hold more moisture than colder air.

Keeping this in consideration, how do you calculate the relative humidity?

CALCULATING RELATIVE HUMIDITY. Calculating the RH requires the correct equation(s). The RH is the amount of moisture in the air (via moisture mass or vapor pressure) divided by the maximum amount of moisture that could exist in the air at a specific temperature (via max moisture mass or saturation vapor pressure).

How can we measure relative humidity?

'Dry' air will contain water vapor with a VP which is less than the SVP at the given temperature. A device to measure relative humidity is called a hygrometer. The simplest hygrometer - a sling psychrometer - consists of two thermometers mounted together with a handle attached on a chain. One thermometer is ordinary.

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