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Revision Notes

Humidity

ICSE · Class 9 · Geography

Quick revision notes for Humidity — ICSE Class 9 Geography. Key concepts, formulas, and definitions for last-minute revision.

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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Key Topics to Revise

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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.

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Full Notes

Key Concepts

Humidity means the amount of waterRelative humidity is the ratio betweenAbsolute humidity is the actual amountCondensation is the change of invisibleClouds are visible collections of tiny

Frequently Asked Questions

What are the important topics in Humidity for ICSE Class 9 Geography?
Key topics in Humidity include Correct vs Incorrect Understanding of Humidity Types, Process of Convectional Rainfall, Humidity Concept Overview. These are the concepts ICSE Class 9 examiners draw on most — study them first, then practise related questions.
How to score full marks in Humidity — ICSE Class 9 Geography?
Understand the core concepts first, then work through the 55 practice questions available for this chapter. Revise formulas and 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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