Class 11 Physics Chapter 12 Kinetic Theory – Revision Notes

Quick revision notes for Class 11 Physics Chapter 12 (Kinetic Theory). These Class 11 Physics Chapter 12 notes are ideal for quick revision just before exams.

Ideal Gas

• PV=nRT; R=8.314 J/(mol·K).
• P=(1/3)ρv_rms².

Temperature and Energy

• Average KE per molecule=(3/2)k_BT.
• Equipartition: each DOF contributes (1/2)k_BT.

Degrees of Freedom

• Monatomic: 3; Diatomic (moderate T): 5.

One-Line Summary

Kinetic theory explains macroscopic gas behaviour (pressure, temperature) as a result of the random motion and collisions of gas molecules, linking temperature directly to average molecular kinetic energy.

Written by Satish

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