Question
Write short notes :
Relative Humidity
Relative Humidity
✓
Answer
(i) The ratio of actual mass of vapor content in the air for a given volume and temperature to that required to make the air saturated with vapor at that temperature is called the relative humidity.
% relative humidity
$=\frac{\begin{array}{c}\text { Actual mass of water vapour in the air } \\ \text { in a given volume }\end{array}}{\begin{array}{c}\text { Mass of water vapour required to } \\ \text { saturate the same volume at same } \\ \text { temperature. }\end{array}} \times 100$
(ii) The relative humidity at the dew point is 100%. If the relative humidity is more than 60% we feel that the air is humid.
(iii) If the relative humidity is less than 60%, we feel that the air is dry.
% relative humidity
$=\frac{\begin{array}{c}\text { Actual mass of water vapour in the air } \\ \text { in a given volume }\end{array}}{\begin{array}{c}\text { Mass of water vapour required to } \\ \text { saturate the same volume at same } \\ \text { temperature. }\end{array}} \times 100$
(ii) The relative humidity at the dew point is 100%. If the relative humidity is more than 60% we feel that the air is humid.
(iii) If the relative humidity is less than 60%, we feel that the air is dry.
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