https://doi.org/10.1351/goldbook.A00418
A term, indicated by a superscript ', which means that a process is not well known or that its value carries uncertainties which are not known, e.g. is the apparent standard Gibbs energy change. In the context of , as in , is recommended. Other notations employed for this property include and .
partial molar quantities
the word is used in a different sense; as a symbol for 'apparent' in this connection the use of subscript