Classical thermodynamics, heat transfer Definition
Thermodynamic system
Definition
A thermodynamic system is a macroscopic body or region of space, separated from the rest of the world, its surroundings, by a boundary of walls. A system is:
- isolated if its walls let through neither matter nor energy;
- closed if its walls let through energy, as heat or work, but no matter;
- open if its walls let through both matter and energy.
Remarks
A gas in a rigid, sealed metal container is a closed system: heat passes through the metal, but no gas does. It is not isolated, because it fails clause 1: heat passes through the walls. A wall that lets no heat through is called adiabatic; a wall that lets heat through is called diathermal.
Further reading
About this page
| Tag | XPRGEHEMWR |
|---|---|
| URI | m2://XPRGEHEMWR |
| Kind | definition |
| Writing | W0 stub |
| MSC | 80A05, 80A10 |
| Defines | Thermodynamic system |
| Changed | 3 November 2026 |
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