- Microcanonical Ensemble: A probability distribution for the state of a system which is isolated from energy changes and has an exact, specified total energy.
- Canonical Ensemble: A probability distribution for the state of a system where the system is in thermal equilibrium with a fixed-temperature heat bath.
- Isothermal-isobaric: A probability distribution for the state of a system where temperature and pressure are held constant.
- Isoenthalpic-isobaric: A probability distribution for the state of a system where enthalpy and pressure are held constant.