In chemical calculation, the value of formula PV=nRT: R is 8.3 14, the unit of P is PA, the unit of V is M 3, the unit of N is mol, and the unit of T is K (Kelvin temperature, i.e. thermodynamic temperature).

State equation describing the relationship between pressure, volume and temperature in ideal gas equilibrium. It is based on Boyle-Edm Edme Mariotte Law, Charles Law and Guy-Lussac Law. It was put forward by French scientist clapper Long in 1834.

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1834, clapper Long expressed Kano's thoughts in mathematical form, and realized the great scientific significance of Kano's The Power of Fire for the first time. This book has actually expressed the second law of thermodynamics. According to these ideas, Claperon first introduced the graphic method into thermodynamics, especially put forward the P-V coordinate system. 1834 deduced the equation of state of ideal gas, which was later extended by Mendeleev (Mendeleev-Clapeyron equation).

The equation to determine the relationship between the melting point and boiling point of a substance and the pressure is also derived, that is, the Claperon-Clausius equation (demonstrated by Clausius in 185 1).