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Question
Define water vapour. Write what you know about water vapour in ten points.
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Solution
Moisture present in the atmosphere in the form of gaseous state is called water vapour.Humidity is the amount of water vapour present in the atmosphere.
1. There is a variation in the content of water vapour in the atmosphere with respect to time and place.
2. As one goes higher in the altitude, the amount of water vapour decreases. Above twelve km from the earth's surface, there is almost no water vapour.
3. In polar regions it is practically absent in winter while in warm and humid equatorial regions have a high amount of water vapour.
4. Water vapour is the source of moisture for clouds, rain and frost.
5. Water vapour is the gas that absorbs heat. Hence, it is so a greenhouse gas. It releases this heat when it condenses.
6. It plays a prominent role in heating and cooling of the atmosphere.
7. When the air gets saturated with the water vapour, at a specific temperature it will form dew or frost as it starts to condense.
8. Water vapour holds its significance as an indirect evidence of the presence of extraterrestrial liquid water on a planet.
9. Clouds are formed due to the condensation of water vapour and their conversion into tiny droplets of water which then precipitates in the form of air, snow, sleet or hail.10. Water vapour is lighter and less dense than dry air.
1. There is a variation in the content of water vapour in the atmosphere with respect to time and place.
2. As one goes higher in the altitude, the amount of water vapour decreases. Above twelve km from the earth's surface, there is almost no water vapour.
3. In polar regions it is practically absent in winter while in warm and humid equatorial regions have a high amount of water vapour.
4. Water vapour is the source of moisture for clouds, rain and frost.
5. Water vapour is the gas that absorbs heat. Hence, it is so a greenhouse gas. It releases this heat when it condenses.
6. It plays a prominent role in heating and cooling of the atmosphere.
7. When the air gets saturated with the water vapour, at a specific temperature it will form dew or frost as it starts to condense.
8. Water vapour holds its significance as an indirect evidence of the presence of extraterrestrial liquid water on a planet.
9. Clouds are formed due to the condensation of water vapour and their conversion into tiny droplets of water which then precipitates in the form of air, snow, sleet or hail.
10. Water vapour is lighter and less dense than dry air.
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