Gibbs Phase Rule Calculator
Gibbs Phase Rule Calculator determines the degrees of freedom in a thermodynamic system. Formula: F = C - P + 2, where C=components, P=phases, F=degrees of freedom.
Formula
F = C - P + 2
- F = degrees of freedom
- C = components
- P = phases at equilibrium
- Standard (1 atm pressure): F = C - P + 1
Water Phase Equilibrium
Inputs
- Number of Components (C): 1
- Number of Phases (P): 3
Pure water (C=1) with ice+water+vapor (P=3): F=1-3+2=0 (triple point, fixed T and P)
Frequently asked questions
What is degrees of freedom?
Number of intensive variables (T, P, composition) you can independently vary at equilibrium
What does F=0 mean?
Invariant system: T and P are fixed (e.g., water triple point at 0.01°C, 611 Pa)