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Behaviour of Perfect Gases and Kinetic Theory of Gases — Syllabus

ICSE · Class 11 · Physics

What Behaviour of Perfect Gases and Kinetic Theory of Gases covers in ICSE Class 11 Physics: 4 topics, for the 2026-27 session.

45 questions35 flashcards20 formulas & key relations5 concepts

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A comparison chart or graph illustrating the conditions under which real gases deviate from ideal gas behavior and when they approximate ideal behavior.
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4 Topics · ICSE Class 11 Physics · 2026-27

Topics in Behaviour of Perfect Gases and Kinetic Theory of Gases

1

1. Perfect Gas and Ideal Gas Equation

  • A perfect gas is an imaginary gas that obeys Boyle's law, Charles' law, and the law of pressure under all conditions.
  • Its molecules are infinitesimally small and there is no intermolecular attraction.
  • Because there is no attraction between molecules, a perfect gas cannot be converted into liquid or solid state.
2

2. Kinetic Theory of Gases and Pressure

  • Gas molecules are very small and are far apart from one another.
  • They move rapidly in straight lines in all possible directions.
  • They collide constantly with one another and with the walls of the vessel.
3

3. rms Speed, Temperature, and Molecular Weight

  • The rms speed of gas molecules is v_rms = √(v̄²).
  • It can also be written as v_rms = √(3P/ρ).
  • For 1 mole, v_rms = √(3RT/M).
4

4. Gas Laws from Kinetic Theory

  • Boyle's law follows from pressure being proportional to mean square speed divided by volume at constant temperature.
  • Charles' law follows from the fact that volume is proportional to absolute temperature at constant pressure.
  • Avogadro's law says equal volumes of all gases at the same temperature and pressure contain equal numbers of molecules.

Key Concepts

Central concept: Behaviour of Perfect Gases and Kinetic Theory of Gases

Perfect GasEquation of StateKinetic Theory of GasesPressure of Ideal GasRMS SpeedThermal EquilibriumDegrees of FreedomEquipartition of Energy

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Frequently Asked Questions

What are the important topics in Behaviour of Perfect Gases and Kinetic Theory of Gases for ICSE Class 11 Physics?
Key topics in Behaviour of Perfect Gases and Kinetic Theory of Gases include Perfect Gas and Ideal Gas Equation, Kinetic Theory of Gases and Pressure, rms Speed, Temperature, and Molecular Weight, Gas Laws from Kinetic Theory. Study these first, then practise questions on each for Class 11 exams.
How should I revise Behaviour of Perfect Gases and Kinetic Theory of Gases for Class 11 exams?
Learn the core ideas first, then work through the 45 practice questions on Behaviour of Perfect Gases and Kinetic Theory of Gases. 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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