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Syllabus

Study of Gas Laws — Syllabus

ICSE · Class 9 · Chemistry

What Study of Gas Laws covers in ICSE Class 9 Chemistry: 4 topics, for the 2026-27 session. Part of the ICSE Class 9 Chemistry syllabus.

42 questions35 flashcards5 formulas & key relations5 concepts

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A diagram illustrating the arrangement and movement of particles in solid, liquid, and gaseous states of matter.
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4 Topics · ICSE Class 9 Chemistry · 2026-27

Topics in Study of Gas Laws

1

Nature and Behaviour of Gases

  • Gas is the state of matter in which inter-particle attraction is weak and inter-particle space is large, so particles move freely and randomly.
  • Gases occupy the entire space of the vessel and take its shape.
  • All gases show uniform behaviour under similar conditions of temperature and pressure, no matter what their chemical nature, colour, or odour is.
2

Pressure, Volume, and Gas Pressure Units

  • Pressure of a gas is the force exerted by the gas per unit area on the walls of the container.
  • Standard pressure of one atmosphere is defined as the pressure exerted by 76 cm of mercury at 0°C and standard gravity of 9.8 m s-2, with mercury density 13.5951 g cm-3.
  • The SI unit of pressure is Pascal.
3

Boyle's Law

  • Robert Boyle systematically studied the pressure-volume relationship of gases.
  • Boyle's law states that the volume of a given mass of a dry gas is inversely proportional to its pressure at constant temperature.
  • For a fixed mass of gas at constant temperature, if pressure increases, volume decreases.
4

Charles's Law

  • Jacques Charles studied the temperature-volume relationship of gases, and Joseph Gay-Lussac further extended this work.
  • Charles's law states that, at constant pressure, the volume of a given mass of a dry gas increases or decreases by 1/273 of its volume at 0°C for each 1°C rise or fall in temperature.
  • If temperature is doubled at constant pressure, volume doubles.

Key Concepts

Central concept: Study of Gas Laws

Gas and its natureMolecular motion and kinetic theoryPressure and volumeBoyle's lawCharles's lawAbsolute zero and Kelvin scaleGas equationStandard temperature and pressure

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Frequently Asked Questions

What are the important topics in Study of Gas Laws for ICSE Class 9 Chemistry?
Key topics in Study of Gas Laws include Nature and Behaviour of Gases, Pressure, Volume, and Gas Pressure Units, Boyle's Law, Charles's Law. Study these first, then practise questions on each for Class 9 exams.
How should I revise Study of Gas Laws for Class 9 exams?
Learn the core ideas first, then work through the 42 practice questions on Study of Gas Laws. 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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