Classical thermodynamics, heat transfer Basic notions of thermodynamics Concept
Internal energy
Summary
The internal energy of a thermodynamic system is the energy contained in it. It excludes the kinetic energy of the motion of the system as a whole and its potential energy in external fields. It is a state function, defined up to an additive constant. The first law of thermodynamics says that it changes by the heat absorbed plus the work done on the system.
Where this leads
42 pages build on this one.
- Heat engine
- Bridgman's thermodynamic equations
- Fundamental thermodynamic relation
- Gibbs–Duhem equation
- Gibbs free energy
- Ideal gas
- Henry's law
- Local thermodynamic equilibrium
- Euler relation for internal energy
- Principle of minimum energy
- Perpetual motion
- Helmholtz free energy
- Heat capacity
- Ehrenfest equations
- Equation of state
- Maxwell equal-area construction
- Thermodynamic square
- Mayer's relation
- Le Chatelier's principle
- Ruppeiner geometry
- Exergy
- Maxwell relations
- Contact geometry of thermodynamics
- Adiabatic process
- GENERIC formalism
- Thermal radiation
- Coefficient of performance
- Isochoric process
- Thermodynamic potential
- Principle of maximum entropy in thermodynamics
- First law of thermodynamics
- Enthalpy
- Legendre transformation of thermodynamic potentials
- Heat
- Conjugate variables
- Isobaric process
- Chemical potential
- Adiabatic flame temperature
- Grand potential
- Thermodynamic stability conditions
- Thermodynamic cycle
- Laws of thermodynamics
Further reading
About this page
| Tag | F6JVQ12X43 |
|---|---|
| URI | m2://F6JVQ12X43 |
| Kind | concept |
| Writing | W0 stub |
| MSC | 80A05, 80A10 |
| Same as | |
| Changed | 3 November 2026 |
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Results about this
- Fundamental thermodynamic relation
- Euler relation for internal energy
- Principle of minimum energy
- First law of thermodynamics
Used by
- Fundamental thermodynamic relation
- Gibbs free energy
- Ideal gas
- Euler relation for internal energy
- Principle of minimum energy
- Helmholtz free energy
- Heat capacity
- Thermodynamic square
- Mayer's relation
- Exergy
- Maxwell relations
- Contact geometry of thermodynamics
- Adiabatic process
- GENERIC formalism
- Thermal radiation
- Isochoric process
- Thermodynamic potential
- Principle of maximum entropy in thermodynamics
- First law of thermodynamics
- Enthalpy
- Legendre transformation of thermodynamic potentials
- Heat
- Conjugate variables
- Isobaric process
- Chemical potential
- Adiabatic flame temperature
- Grand potential
- Thermodynamic stability conditions
- Thermodynamic cycle
- Laws of thermodynamics