A-Level Physics · 15 Ideal gases
Root-mean-square molecular speed for A-Level Physics
Root-mean-square molecular speed is mapped to 15 Ideal gases in the Cambridge International AS & A Level Physics pathway. Use this public guide to see exactly where the concept fits, what to master, and which GioPhysics resource continues the study sequence.
Where this fits
15 Ideal gases
- Curriculum
- Cambridge International AS & A Level Physics
- Theme or group
- A Level extension
- Current framework
- Examinations in 2025–2027 · Version 1
The ideal gas equation and kinetic theory are in Chapter 40, with mean-square speeds in the molecular-speeds lesson.
Mastery checklist
Know what success looks like.
- 01
Define the system and distinguish temperature, internal energy, and transferred energy.
- 02
Connect the macroscopic process to a particle or molecular explanation.
- 03
Use an energy balance with consistent signs, units, and process assumptions.
Exam lens
Build, apply, check.
15 Ideal gases sits inside A Level extension. Build the concept first, then practise selecting a model, showing working, and checking the final result.
Teaching sequence
15 Ideal gases
This syllabus point maps to 3 ordered concept guides.
- 01The mole and the ideal-gas equation
- 02Kinetic theory and molecular pressure
- 03Root-mean-square molecular speedCurrent guide