Index B | C | E | G | H | I | K | M | O | P | Q | R | S | T | W B Boundary C Canonical ensemble Chemical contact Chemical equilibrium Closed system E Ensemble Equation of state Equilibrium Extensive property G Grand canonical ensemble H Heat I Intensive property Internal energy Irreversible process Isolated system K Kinetic energy M Mechanical equilibrium Microcanonical ensemble Microscopic state (classical) (quantum) O Open system P Particle Path function Potential energy Process Q Quasi-static process R Reversible process S State function State variable Surroundings System T Thermal contact Thermal equilibrium Thermodynamic equilibrium Thermodynamic state W Work