## Wikipedia - Regola delle fasi 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]