Learning objective
(Physics only) Explain why increasing the volume of a gas at constant temperature decreases its pressure.
Read the explanation, check the common trap, then practise with flashcards and questions.
At a glance
5
Flashcards
7
Questions
Topic
Particle model and pressure
Subtopic
Pressure in gases (physics only)
Study support
Understand this objective
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
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.
Revision tools
Choose how to practise
Flashcards5 linked cards
Flashcard 1 of 5
Practice Questions7 linked questions
Question 1 of 7
Choose an answer, get feedback, then move sideways through the set.
Revision notestopic notes
Open the full topic revision notes when you are ready to review this objective in context.
Open revision notesRelated learning objectives
- Describe gas particles as moving in constant random motion.
Particle motion in gases
- Explain that gas particles collide with each other and with the walls of their container.
Particle motion in gases
- Explain that collisions of gas particles with container walls exert a force on the walls.
Particle motion in gases
- Explain that the force from particle collisions produces gas pressure.
Particle motion in gases
- Describe how increasing temperature increases the average kinetic energy of gas particles.
Particle motion in gases
