GENERAL KNOWLEDGE

Detailed explanation-1: -The weight of water vapor per unit weight of air is called Specific humidity. It is usually expressed as grams of vapor per kilogram of air. The rate of evaporation of water from any surface is directly proportional to the specific humidity, the difference between the surface and the adjoining air.

Detailed explanation-2: -Relative humidity, RH, is the ratio of the amount of water vapor present in the air to the maximum amount of water vapor needed for saturation at a certain pressure and temperature. It is typically multiplied by 100 and expressed as a percent.

Detailed explanation-3: -Absolute humidity, which describes air’s water content, is used to measure the weight of water vapour per unit volume of air. The absolute humidity unit is given as g.m-3 which is units of grams of water vapour per cubic metre of air. Since other factors constantly affect absolute humidity, the results are less useful.

Detailed explanation-4: -Relative humidity can be defined as the amount of water vapor in air at a given temperature compared to what that air could hold at that temperature. For instance, in the example, air at 60 degrees F can hold (has a capacity/will be saturated when it holds) 10.7 g/kg.