Water in the Atmosphere — Syllabus
CBSE · Class 11 · Geography
What Water in the Atmosphere covers in CBSE Class 11 Geography: 4 topics, for the 2026-27 session. Part of the CBSE Class 11 Geography syllabus.
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Topics in Water in the Atmosphere
Water Vapour and Humidity
- Water vapour varies from zero to four per cent by volume of the atmosphere.
- Water in the atmosphere exists in three forms: gaseous, liquid, and solid.
- Moisture enters the atmosphere through evaporation from water bodies and transpiration from plants.
Evaporation and Condensation
- Evaporation changes water from liquid to gaseous state.
- Heat is the main cause of evaporation.
- Latent heat of vaporisation is the heat needed to convert a unit mass of liquid into vapour without a change in temperature.
Dew, Frost, Fog, Mist, and Smog
- After condensation, moisture may appear as dew, frost, fog, or clouds.
- Dew forms as water droplets on cooler surfaces of solid objects such as stones, grass, and leaves.
- For dew formation, the dew point must be above the freezing point.
Clouds
- Clouds are masses of minute water droplets or tiny ice crystals formed by condensation in free air at considerable heights.
- Clouds are classified into four basic types: cirrus, cumulus, stratus, and nimbus.
- Cirrus clouds form at high altitudes between 8,000 m and 12,000 m.
Key Concepts
Central concept: Water in the atmosphere and its movement through evaporation, condensation, and precipitation
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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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