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Syllabus

Humidity — Syllabus

ICSE · Class 9 · Geography

What Humidity covers in ICSE Class 9 Geography: 4 topics, for the 2026-27 session. Part of the ICSE Class 9 Geography syllabus.

55 questions40 flashcards5 concepts

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A comparison chart explaining the definitions, units, and behavior with temperature changes for absolute and relative humidity.
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4 Topics · ICSE Class 9 Geography · 2026-27

Topics in Humidity

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1. Meaning of Humidity

  • Humidity is the amount of water vapour present in the air at a particular time and place.
  • Water in the atmosphere occurs as ice, liquid water, and water vapour.
  • Humidity is measured in percentage.
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2. Relative Humidity and Absolute Humidity

  • Relative humidity is the ratio between the actual amount of water vapour present in the air and the maximum amount of water the air can hold at that temperature.
  • Relative humidity is always expressed in percentage.
  • 100% relative humidity means air is fully saturated and cannot hold more water vapour, so rain may occur.
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3. Condensation and Forms of Condensation

  • Condensation is the change of invisible water vapour into water or ice.
  • Condensation depends on the relative humidity of air and the rate of cooling.
  • If air is cooled below its dew point, water vapour becomes liquid.
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4. Classification of Clouds

  • Low clouds are found from the surface up to 2000 m.
  • Low clouds include stratocumulus, nimbostratus, cumulus, cumulonimbus, stratus, and nimbus.
  • Medium clouds are found from 2000 m to 6000 m.

Key Concepts

Central concept: Humidity and rainfall are controlled by water vapour, cooling, condensation, and air movement

HumidityRelative HumidityAbsolute HumidityCondensationForms of CondensationCloudsCloud TypesPrecipitation

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Frequently Asked Questions

What are the important topics in Humidity for ICSE Class 9 Geography?
Key topics in Humidity include Meaning of Humidity, Relative Humidity and Absolute Humidity, Condensation and Forms of Condensation, Classification of Clouds. Study these first, then practise questions on each for Class 9 exams.
How should I revise Humidity for Class 9 exams?
Learn the core ideas first, then work through the 55 practice questions on Humidity. 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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All ICSE Class 9 Geography Syllabus

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