| LaTeX Math Block | ||||
|---|---|---|---|---|
| ||||
F = C - P +2 |
where
| number of degrees of freedom | ||||
| number of mixture components | ||||
| number of phases |
Pure substance
For Pure substance:
and LaTeX Math Inline body C=1
.LaTeX Math Inline body F = 3 - P
It means that 3-Phase Equilibrium (solid, liquid an gas) has zero degrees of freedom :
thus making a single point on Phase Equilibrium Diagram, called Triple Point and characterized by a certain Temperature and Pressure. LaTeX Math Inline body F = 0
The 2-Phase Equilibrium has one degree of freedom:
and form a smooth line on Phase Equilibrium Diagram.LaTeX Math Inline body F=1
Binary Mixture
For Binary Mixture:
and LaTeX Math Inline body C=2
.LaTeX Math Inline body F = 4 - P
It particularly means that 2-Phase Equilibrium of Binary Mixture has two degrees of freedom :
and covers a 2-dimensional area on Phase Equilibrium Diagram. LaTeX Math Inline body F = 2
See also
Natural Science / Physics / Thermodynamics / Thermodynamic system / Phase / Phase Equilibrium
[ State of matter ][ Pure substance ] [ Mixture ][ Fluid Mixture ]
[ Thermodynamic equilibrium ][ Vapour Liquid Equilibrium (VLE) ]