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The isoenthalpic-isobaric ensemble (constant enthalpy and constant pressure ensemble) is a statistical mechanical ensemble that maintains constant enthalpy and constant pressure applied. It is also called the NpH-ensemble, where the number of particles is also kept as a constant. It was developed by physicist H. C. Andersen in 1980. The ensemble adds another degree of freedom, which represents the variable volume of a system to which the coordinates of all particles are relative. The volume becomes a dynamical variable with potential energy and kinetic energy given by .. The enthalpy is a conserved quantity.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Isoenthalpic–isobaric_ensemble". A list of authors is available in Wikipedia.