phase rule

https://doi.org/10.1351/goldbook.P04533
The number of @D01572@, \(F\), that a system containing \(C\) components can have when \(P\) phases are in equilibrium, is given as: \[F=C- P+2\]
Source:
PAC, 1994, 66, 577. (Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations 1994)) on page 588 [Terms] [Paper]