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Revision Notes

Water in the Atmosphere — Revision Notes

CBSE · Class 11 · Geography

Water in the Atmosphere revision notes for CBSE Class 11 Geography: 4 topics in quick points. Part of the CBSE Class 11 Geography syllabus.

61 questions90 flashcards5 concepts

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Key Topics to Revise

1

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.
2

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.
3

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.
4

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.

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Full Notes

Key Concepts

Humidity means water vapour presentAbsolute humidity is the actual amountRelative humidity is the percentageDew point is the temperature atCondensation is the transformation of water

Frequently Asked Questions

What are the important topics in Water in the Atmosphere for CBSE Class 11 Geography?
Key topics in Water in the Atmosphere include Water Vapour and Humidity, Evaporation and Condensation, Dew, Frost, Fog, Mist, and Smog, Clouds. Study these first, then practise questions on each for Class 11 exams.
How should I revise Water in the Atmosphere for Class 11 exams?
Learn the core ideas first, then work through the 61 practice questions on Water in the Atmosphere. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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