RELATIVE HUMIDITY

Relative humidity refers to the ratio between the actual amount of water vapour in a given volume of air at a particular temperature and the total amount of water vapour needed to saturate the given volume of air at that temperature.

FORMULA

RELATIVE HUMIDITY=  AMOUNT OF WATER VAPOUR IN THE AIR     X          100%

TOTAL AMOUNT OF WATER VAPOUR NEEDED TO SATURATE AIR

HYGROMETER

wet and dry bulb thermometer (hygrometer)

Digital Hygrometer

Humidity Counts

How to calculate the Relative Humidity

The dry bulb thermometers measures 22 C and the wet bulb thermometer measures 21 C , the wet bulb depression is then 1 C. When the wet bulb depression is 1 C and the dry bulb thermometer is 22 C , the relative humidity is 90% . A relative humidity of 90% indicates that there is a lot of moisture in the air at that temperature.

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