Random Molecular Motion
Particles bounce inside a box, faster as T rises.
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Class 11 · Notes
Kinetic Theory of Gases— Notes, Formulas & Revision
Complete revision notes and formulas for Kinetic Theory of Gases (Class 11). Curated for JEE, NEET, AP Physics, SAT, and CUET. Tap any topic to open the live simulation and full PYQ set.
Wall Collisions → Pressure
Δp = 2mv per elastic hit — pressure builds.
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Pressure from Molecular Theory
P = ⅓ ρ⟨v²⟩ — kinetic origin of pressure.
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RMS / Avg / Most-Probable Speeds
Compare H₂, He, N₂, O₂, CO₂.
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Temperature ↔ Kinetic Energy
⟨KE⟩ = (3/2) k_B T — linear in T.
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Maxwell-Boltzmann Distribution
Speed distribution f(v) — peaks shift with T.
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Boyle's Law
PV = const at fixed T.
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Charles's Law
V/T = const at fixed P.
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Pressure vs Temperature
P/T = const at fixed V (Gay-Lussac).
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Mean Free Path
λ = 1/(√2 πd²n) — distance between collisions.
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Degrees of Freedom
Mono / diatomic / polyatomic — Cv, Cp, γ.
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Kinetic Theory of Gases on sciphylab (also known as SciPhy, SciPhy Lab, SciPhy Labs). Free physics revision for Class 11, JEE Mains, JEE Advanced, NEET UG, AP Physics 1/2/C, SAT Subject Physics, and CUET-UG.