Learning objective

(Physics only) Explain why increasing the volume of a gas at constant temperature decreases its pressure.

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At a glance

5

Flashcards

7

Questions

Topic

Particle model and pressure

Subtopic

Pressure in gases (physics only)

AQA GCSE PhysicsParticle model of matter

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Short explanation

(Physics only) Explain why increasing the volume of a gas at constant temperature decreases its pressure. Exam lens: Write the relationship, substitute values only when needed, and finish by interpreting the result. In Pressure in gases (physics only), this means density links mass and volume, so the answer must preserve which quantity is being calculated. The answer should use the approved wording from Particle model and pressure, include pressure, volume, constant temperature, and avoid drifting into another section of Particle model of matter. For revision, practise saying the exact objective aloud, then add the one calculation, particle movement, collision, graph, or practical detail that makes the statement true. A strong exam response for checkpoint 76 is specific to (Physics only) Explain why increasing the volume of a gas at constant temperature decreases its pressure and does not reuse a generic explanation from a neighbouring objective.

Key concepts

gas pressurevolume

Why it matters

This objective helps connect Pressure in gases (physics only) to exam-style questions, flashcards, and revision notes for Particle model and pressure.

Common mistakes

1 linked
  • Volume and Pressure Relationship: To fix this, remember that at constant temperature, increasing the volume of a gas allows particles to collide with the walls less frequently, which decreases the pressure.

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Related learning objectives

(Physics only) Explain why increasing the volume of a gas at | AQA Physics | ExamCompanion