Give detailed account of various types of humidity.
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Meaning of Humidity:
Humidity is a general term which indicates the amount of water vapours in the air. There is a close relationship between humidity and the temperature of air.
The capacity of the air to contain water vapour depends upon the temperature. The water holding capacity of air increases with increase in temperature. Higher the temperature, higher is the water holding capacity of air.
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Types of Humidity:
(i) Relative humidity,
(ii) Specific humidity,
(iii) Mixing ratio, and
(iv) Absolute humidity.
✔i. Relative Humidity:
The measure of humidity is generally called relative humidity. Saturation mixing ratio is used to determine relative humidity.
It is defined as the amount of water vapours in grams available in one kilogram of dry air. One of the most important measure of humidity is dew point.
✔ii. Specific Humidity:
It is the ratio of mass of water vapours actually present in the air to a unit mass of air including the water vapour (dry air + moisture). It is expressed as grams of water vapour per kg of moist air mass.
The amount of water vapour that air can hold depends upon temperature. Specific humidity at 20°C is 15g per kg. At 30°C, it is 26 g per kg and at -10°C, it is 2 g per kg.
✔iii. Mixing Ratio:
It is defined as the ratio of mass of water vapours per unit mass of dry air. It is also defined as the ratio of density of water vapours to the density of dry air. It varies from 1 g per kg in arctic zone to 40 g per kg in humid equatorial zone.
✔iv. Absolute Humidity:
It is defined as the weight of water vapours in a given volume of air. It is expressed as grams of water vapours per cubic meter of air (g m^-3).
Absolute humidity is rarely used because it varies with the expansion and contraction of air. It varies with temperature, even though the amount of water vapours remains constant.
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Meaning of Humidity:
Humidity is a general term which indicates the amount of water vapours in the air. There is a close relationship between humidity and the temperature of air.
The capacity of the air to contain water vapour depends upon the temperature. The water holding capacity of air increases with increase in temperature. Higher the temperature, higher is the water holding capacity of air.
✴✴✴✴✴✴✴✴
Types of Humidity:
(i) Relative humidity,
(ii) Specific humidity,
(iii) Mixing ratio, and
(iv) Absolute humidity.
✔i. Relative Humidity:
The measure of humidity is generally called relative humidity. Saturation mixing ratio is used to determine relative humidity.
It is defined as the amount of water vapours in grams available in one kilogram of dry air. One of the most important measure of humidity is dew point.
✔ii. Specific Humidity:
It is the ratio of mass of water vapours actually present in the air to a unit mass of air including the water vapour (dry air + moisture). It is expressed as grams of water vapour per kg of moist air mass.
The amount of water vapour that air can hold depends upon temperature. Specific humidity at 20°C is 15g per kg. At 30°C, it is 26 g per kg and at -10°C, it is 2 g per kg.
✔iii. Mixing Ratio:
It is defined as the ratio of mass of water vapours per unit mass of dry air. It is also defined as the ratio of density of water vapours to the density of dry air. It varies from 1 g per kg in arctic zone to 40 g per kg in humid equatorial zone.
✔iv. Absolute Humidity:
It is defined as the weight of water vapours in a given volume of air. It is expressed as grams of water vapours per cubic meter of air (g m^-3).
Absolute humidity is rarely used because it varies with the expansion and contraction of air. It varies with temperature, even though the amount of water vapours remains constant.
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Various types of humidity.
Explanation:
- In simple words, humidity is understood as the amount and presence of water vapor that is present in the atmosphere.
- Humidity is also further categorized into different parts.
- Absolute humidity and relative humidity.
- At a certain or the surrounding temperature in which the amount of water is present in the absolute humidity.
- Whereas relative humidity is termed as the measurement of current humidity which coordinated with the relation to the surrounding or given temperature.
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