Question

How is relative humidity related to the dew point ?

Answer 1

Hint:Humidity is the measure of amount of water vapours present in the atmosphere. Dew is the water drops that make the atmosphere moisture. The measure of humidity and the dew point makes the atmosphere cool and hot. The dew point can cause extreme conditions of cold. The weather is determined by the level of relative humidity and the dew point.

Complete answer:
(i) The relative humidity is the ratio of amount of water vapours present in the air to the maximum amount of water vapours can be present in the atmosphere.
(ii) The dew point is the complete humidity which means 100% humidity. The dew point is the saturation point of humidity of the atmosphere. The dew point is defined as the temperature in which air is to be cooled to attain the 100% relative humidity. Hence there is no chance of holding more water vapours. This saturation causes fog.

(iii) Hence the dew point is related to relative humidity.
(iv) The relative humidity decreases in the high temperature. The high temperature in the atmosphere causes the atmosphere to hold more water vapours. This reduces the moisture content in the atmosphere. Therefore the dew point in the atmosphere decreases.
(v) The factors affecting the relative humidity are temperature and pressure. Because if the air is warmer, the amount of water vapours that makes the air cooled will be more. This directly affects the relative humidity and the dew point of that atmosphere.

Note:The ratio of amount of water vapours present in the atmosphere to the maximum amount of water vapours that the atmosphere can hold is called as relative humidity. The dew point is the 100% relative humidity which means the amount of water vapours present in the atmosphere is in maximum amount. The relative humidity decreases with the high in temperature and pressure.