Water in the Atmosphere — Chapter Summary
CBSE · Class 11 · Geography
Summary of Water in the Atmosphere for CBSE Class 11 Geography. Key concepts: Humidity means water vapour, Absolute humidity is and Relative humidity is.
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Overview
Water vapour is a key part of the atmosphere and changes the weather and rainfall pattern. Water in the atmosphere exists in three forms: gaseous, liquid, and solid. It enters the air mainly by evaporation from water bodies and transpiration from plants, and returns to the surface through condensati
Key Concepts
Humidity means water vapour present
Humidity means water vapour present in the air. It is a basic measure of atmospheric moisture and is closely linked with weather changes.
Absolute humidity is the actual amount
Absolute humidity is the actual amount of water vapour present in the atmosphere. It is the weight of water vapour per unit volume of air and is expre
Relative humidity is the percentage
Relative humidity is the percentage of moisture present in the atmosphere compared with its full capacity at a given temperature. It is greater over o
Dew point is the temperature at
Dew point is the temperature at which saturation occurs in a given sample of air.
Condensation is the transformation of water
Condensation is the transformation of water vapour into water. It happens when moist air cools and can no longer hold all its vapour.
Learning Objectives
- Understand the forms in which water exists in the atmosphere
- Define humidity, absolute humidity, relative humidity, and dew point
- Explain evaporation and condensation as parts of the water cycle
- Identify the conditions and formation of dew, frost, fog, mist, and smog
- Classify clouds into cirrus, cumulus, stratus, and nimbus
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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