The gravity model has been frequently used for explaining human geographical phenomena in the early years of the twentieth century. According to the gravity model, the migration between two places is directly proportional to the product of the population of the two centres, and inversely proportional to the square of the distance between the two.It implies that the capacity of an area to attract migrants depends upon the size of its population or its economic potential. The distance is considered as a hindrance to the population movement.
Humidity is the amount of water vapour present in air. Absolute Humidity is the weight of actual amount of water vapour present in unit volume of air.Relative Humidity is the Ratio of water vapour in air at a particular temp. to total amount of water vapour required to saturate the same air at same temperature. It is expressed in %Specific Humidity is the Weight of water vapour present in per unit weight of air. It is not affected by change in pressure or temperature.
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