Water in Atmosphere – Geography

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Water in Atmosphere : Water is present in the atmosphere in three forms-gaseous,liquid and solid.There is continuous exchange of water between the atmosphere,the oceans and the continents through the process of  evaporation,transpitration,condensation and precipitation.Water vapour present in the air is known as humidity and it varies from zero to four percent by volume of the atmosphere and plays an important role in weather phenomenon.

Solar radiation and heat budget :Click here to read

Absolute Humidity

The actual amount of the water vapour present in the atmosphere is called absolute humidity and expressed in gram per cubic metre and it differs from place to place on the surface of the earth.

Relative Humidity

The percent of moisture present in the atmosphere as compared to its full capacity at a given temperature is known as relative humidity.The ability of the  air to hold water vapour depends on its temperature inturn affect relative humidity.Relative humidity is greater over oceans and least over continent.

Dew Point

The temperature at which saturation (when the air contains moisture to its fullest capacity at a given temperature and incapable of holding any additional amount of moisture at that stage)occurs in a given sample of air is known as dew point.

Basic Climatology terms : click here 

Evaporation

It is a process by which water is transformed from liquid to gaseous state.Increase in temperature increases water absorption and  potential of air to absorb & retain moisture.Movement of layer replaces saturated layer with unsaturated layer.Hence greater the movement of air greater evaporation.

Latent heat of vaporization

The temperature at which water starts evaporating is referred to as the latent heat of vaporization.

 

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