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
partial molar quantities the word is used in a different sense; as a symbol for '
apparent' in this connection the use of subscript
, as in
, is recommended. Other notations employed for this property include
and
.
Source:
PAC, 1986, 58, 1405
(Recommendations for the presentation of thermodynamic and related data in biology (Recommendations 1985))
on page 1408
