Cheat sheet · NEET Preparation Physics
Thermodynamics cheat sheet
The whole chapter on one page: key formulas, facts and the points to remember, for quick revision before a test.
NEET · Physics
Cheat sheet
Class 11 · Chapter 11Thermodynamics
ΔQ = ΔU + ΔW — heat in = internal energy up + work out.
1. Laws
Zeroth law
Two systems each in equilibrium with a third are in equilibrium with each other — defines temperature.
First law
(energy conservation).
Second law
No engine is 100% efficient; heat doesn't flow cold → hot by itself (Kelvin–Planck, Clausius).
2. Processes (ideal gas)
| Process | Constant | Work done |
|---|---|---|
| Isothermal | T | |
| Adiabatic | Q = 0 | |
| Isobaric | P | |
| Isochoric | V | 0 |
Adiabatic: = constant, .
3. Engines & Refrigerators
(coefficient of performance)
4. Key Points
- U of an ideal gas depends only on T.
- Carnot engine: 2 isothermal + 2 adiabatic.
- Reversible processes are idealisations.
- Heat and work are path functions; U is a state function.
Remember: ΔQ = ΔU + ΔW | 4 processes | Carnot η = 1 − T₂/T₁
Thermodynamics: questions and notes
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- Waves
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