Pressure, absolute Terms Links

A precise definition of the term standard state has been given by lUPAC [82LAF], The fact that only changes in thermodynamic parameters, but not their absolute values, can be determined experimentally, makes it important to have a well-defined standard state that forms a base line to which the effect of variations can be referred. The lUPAC [82LAF] definition of the standard state has been adopted in the NEA-TDB project. The standard state pressure, p° = Q. MPa (1 bar), has therefore also been adopted, cf. Section II.3.2. The application of the standard state principle to pure substances and mixtures is summarised below. It should be noted that the standard state is always linked to a reference temperature, cf. Section II.3.3. 

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