Revision Notes for JEE Physics: Thermodynamics
Explore reliable concept summaries and revision materials through the JEE Physics Thermodynamics Notes Set 02. Tailored for JEE learners, utilizing these notes for Physics Thermodynamics ensures thorough preparation and strengthens core academic definitions before final evaluations.
Review Thermodynamics for JEE Physics
View or download the dedicated Thermodynamics revision resource below. Engaging with these structured concept notes daily ensures continuous academic progress and mastery of the 2026-27 curriculum for Physics.
First Law and State Functions
1. \(\Delta U = Q - W\) where \(W\) is work done by the gas. \(U\) is a state function, while \(Q\) and \(W\) depend on the path.
2. Work \(W = \int P\,dV\) is the area under the P-V curve. It is positive for expansion.
3. For a complete cycle \(\Delta U = 0\), so net work equals net heat.
Processes of an Ideal Gas
| Process | Condition | Work | Heat |
|---|---|---|---|
| Isothermal | \(PV\) constant | \(nRT\ln(V_2/V_1)\) | \(Q = W\) |
| Isobaric | \(P\) constant | \(P\Delta V\) | \(nC_p\Delta T\) |
| Isochoric | \(V\) constant | 0 | \(nC_v\Delta T\) |
| Adiabatic | \(PV^\gamma\), \(TV^{\gamma-1}\) constant | \(\dfrac{P_1V_1 - P_2V_2}{\gamma - 1}\) | 0 |
1. \(C_p - C_v = R\), \(\gamma = C_p/C_v\). Monoatomic \(C_v = 3R/2\), diatomic \(5R/2\).
2. For a process \(V \propto T^m\) the molar heat capacity is \(C = C_v + R/m\), and \(W = mR\Delta T\) per mole.
3. For a mixture: \(C_v\) is the mole-weighted average of the \(C_v\) values, then \(\gamma = (C_v+R)/C_v\).
4. On V-T graph a line through the origin is an isobar, horizontal is isochoric and vertical is isothermal.
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