The Laws That Govern Energy
Understanding these 4 laws is the difference between guessing and scoring. Know each law's scope and its exam application.
Thermal Equilibrium
If A is in thermal equilibrium with C, and B is in thermal equilibrium with C, then A and B are in thermal equilibrium with each other.
📌 Defines temperature as a state function. Basis of thermometry.
Conservation of Energy
Heat supplied to a system equals the increase in internal energy plus the work done by the system. Energy is conserved.
📌 Most tested law. Every thermodynamic problem starts here.
Entropy & Spontaneity
Heat cannot flow from a colder body to a hotter body spontaneously. Entropy of an isolated system always increases.
📌 Carnot engine, efficiency, entropy — critical for JEE/NEET.
Absolute Zero
The entropy of a perfect crystal at absolute zero is zero. It is impossible to reach absolute zero temperature in finite steps.
📌 Mainly JEE Advanced conceptual questions. Rarely tested in NEET.
Exam Insight
In JEE Main 2023, 3 out of 5 thermodynamics questions were based on the First Law applied to different processes. If you can't apply ΔU = Q − W blindfolded across all process types, you're leaving easy marks on the table.
Study for Your Exam
Each exam tests thermodynamics differently. Select your exam to see tailored content.
CBSE Boards
Definition-based, derivations, numericals. 5–7 marks expected.
NEET
Concept-based MCQs. 4–5 questions per exam. High frequency topic.
JEE Main
Numerical + conceptual mix. 2–3 questions. Medium difficulty.
JEE Advanced
Multi-concept, graph analysis, paragraph problems. High difficulty.
Topics Covered
Zero topic left uncovered. From basics to JEE Advanced level thinking.
Thermal Equilibrium
Zeroth Law, temperature, thermometers
First Law of Thermodynamics
Internal energy, heat, work
Internal Energy
Kinetic theory connection, degrees of freedom
Thermodynamic Processes
Isothermal, adiabatic, isobaric, isochoric
Heat Capacities
Cp, Cv, γ = Cp/Cv, Mayer's relation
Second Law & Entropy
Reversible vs irreversible, heat engines
Carnot Engine
Cycle, efficiency, refrigerator
PV Diagrams
Work = area, cycle analysis, slopes
Advanced Applications
Mixed processes, JEE paragraph problems
Everything You Need to Rank Better
Exam Toggle
Switch between CBSE, NEET, JEE Main, and JEE Advanced modes. Content depth adapts to your target exam.
Formula Searchbank
Instantly search any formula, variable, or concept from the entire thermodynamics chapter.
Practice Timer
Timed practice sessions that simulate exam conditions. Track your speed and accuracy.
PYQ Analysis
10-year trend analysis showing which topics appear most, difficulty patterns, and question types.
Calculator Tools
Interactive thermodynamics calculators: heat flow, gas laws, Carnot efficiency, and more.
Flashcard System
Quick revision flashcards for all key formulas and concepts. Flip to reveal answers.
The student who understands that the area under a PV curve is work, and can calculate it for any process without looking at the formula sheet — that student scores 10/10 in thermodynamics. Be that student.
Ready to Master Thermodynamics?
Begin with Core Concepts and work your way through to the Practice section. The content is structured to build your understanding systematically.