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Revision Notes

Atmospheric Moisture — Revision Notes

ICSE · Class 11 · Geography

Atmospheric Moisture revision notes for ICSE Class 11 Geography: 4 topics in quick points. Part of the ICSE Class 11 Geography syllabus.

65 questions46 flashcards2 formulas & key relations5 concepts

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Key Topics to Revise

1

1. Moisture in the Atmosphere and the Hydrologic Cycle

  • Moisture comes into the atmosphere mainly through evaporation from water bodies.
  • Moisture is present in all three forms: gaseous water vapour, liquid droplets, and solid ice crystals.
  • It forms only 0 to 4% of the atmosphere, yet it is the most important constituent for weather and climate.
2

2. Evaporation

  • Evaporation is the process by which water changes from liquid to vapour or gas.
  • Evaporation supplies water vapour to the atmosphere.
  • About 600 calories of energy are required to convert 1 gram of water into water vapour without a change in temperature; this is called latent heat.
3

3. Humidity and Its Types

  • Humidity means the amount of water vapour present in the air.
  • Humidity is measured in grams per cubic metre.
  • At a given temperature, air can hold only a fixed amount of water vapour; this limit is called saturation point and the air is then called saturated air.
4

4. Condensation, Dew Point, Dew, Frost, Fog, and Mist

  • Condensation is the change of state from gaseous to liquid or solid.
  • Dew point is the temperature at which saturation occurs or water vapour begins to change into water.
  • Condensation in free air happens around condensation nuclei such as dust, smoke, and salt particles.

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Full Notes

Key Concepts

Atmospheric moisture exists as water vapourWater moves continuously between oceansEvaporation is the change of waterAbout 600 calories of energyHumidity means the amount of water

Frequently Asked Questions

What are the important topics in Atmospheric Moisture for ICSE Class 11 Geography?
Key topics in Atmospheric Moisture include Moisture in the Atmosphere and the Hydrologic Cycle, Evaporation, Humidity and Its Types, Condensation, Dew Point, Dew, Frost, Fog, and Mist. Study these first, then practise questions on each for Class 11 exams.
How should I revise Atmospheric Moisture for Class 11 exams?
Learn the core ideas first, then work through the 65 practice questions on Atmospheric Moisture. 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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