🔥 Thermodynamics – Ultimate Recap (JEE Level)

Concepts • Laws • Traps • IIT Logic

1️⃣ Basic Definitions (Never Forget)

System: Part under study
Surroundings: Everything else
State variable: Depends only on state (P, V, T, U, S)
Path variable: Depends on process (Q, W)

2️⃣ Zeroth Law of Thermodynamics

If A is in thermal equilibrium with B and C separately, then B and C are in equilibrium with each other.
Defines temperature.

3️⃣ First Law of Thermodynamics

ΔU = Q − W

Heat added to system → Q positive
Work done by system → W positive
Internal energy is a state function

Cyclic process: ΔU = 0 ⇒ Q = W

4️⃣ Important Thermodynamic Processes

Isothermal: T constant → ΔU = 0 → Q = W
Adiabatic: Q = 0 → ΔU = −W
Isochoric: V constant → W = 0 → Q = ΔU
Isobaric: P constant → W = PΔV

5️⃣ Ideal Gas Essentials

PV = nRT
Internal energy depends only on temperature
U = (f/2) nRT
γ = C_P / C_V

6️⃣ Second Law of Thermodynamics

❌ Heat cannot completely convert into work in a cycle ❌ Heat does not flow from cold to hot without work

Kelvin–Planck: No 100% efficient engine
Clausius: Refrigerator needs work

7️⃣ Entropy (Most Important for Advanced)

dS = δQ_rev / T
Entropy is a state function
For isolated system: ΔS ≥ 0
Reversible: ΔS = 0 (universe)
Irreversible: ΔS > 0

8️⃣ Heat Engine & Refrigerator

Efficiency = W / Q_hot
η_max = 1 − T_cold/T_hot
Carnot engine is ideal and reversible

9️⃣ IIT JEE Traps & Golden Rules

Entropy of universe never decreases
ΔU = 0 does NOT mean Q = 0 or W = 0
Heat & work are NOT state functions
Check entropy before final answer

🔟 Exam-Day Strategy

Identify process first
Apply laws, not formulas blindly
Eliminate options violating entropy
Reversible = maximum efficiency

🏁 Thermodynamics Recap COMPLETE
✅ Ready for JEE Main & Advanced

📚 IIT–JEE PHYSICS MASTER LIBRARY (ADVANCED)

One-stop structured learning hub for JEE Advanced Physics
Concepts • Objective Questions • Final Revision • Complete Libraries

🔥 Thermodynamics – Objective Final Revision

Thermodynamics – Set 1
Set 2
Set 3
Set 4
Set 5
Set 6
Set 7
Set 8
Set 9
Set 10
Set 11
Set 12
Set 13
Set 14
Set 15
Set 16
Set 17
Set 18
Set 19
Set 20
Set 21
Set 22
Set 23
Set 24
Set 25
Set 26
Set 27
Set 28
Set 29
Set 30
Set 31
Set 32
Set 33
Set 34
Set 35
Set 36
Set 37
Set 38
Set 39
Set 40
Set 41
Set 42
Set 43
Set 44
Set 45
Set 46
Set 47
Set 48
Set 49
Set 50
Set 51
Set 52
Set 53
Set 54
Set 55
Set 56
Set 57
Set 59

📘 Complete Physics Libraries

🔗 Learning Hubs & Community

© Mind Grow Magazine | Structured for Serious IIT–JEE Aspirants

No comments:

Post a Comment

Subscribe to: Post Comments (Atom)