High Quality Content by WIKIPEDIA articles! According to van der Waals, the theorem of corresponding states (or principle of corresponding states) indicated that all fluids, when compared at the same reduced temperature and reduced pressure, have approximately the same compressibility factor and all deviate from ideal gas behavior to about the same degree. Material constants that vary for each type of material are eliminated, in a recast reduced form of a constitutive equation. The reduced variables are defined in terms of critical variables. It originated with the work of Johannes Diderik van der Waals in about 1873 when he used the critical temperature and critical pressure to characterize a fluid. The most prominent example is the van der Waals equation of state, the reduced form of which applies to all gases/fluids.

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