Gibbs Phase Rule
Using the Gibbs Phase rule, how many degrees of freedom exist at the triple point of water?
Expand Hint
Gibbs Phase Rule (non-reacting systems):
$$$P+F=C+2$$$
where
$$P$$
is the number of phases making up a system,
$$F$$
is the degrees of freedom, and
$$C$$
is the number of components in a system.
Hint 2
The triple point of a substance is where a specific temperature and pressure causes three phases (solid, liquid, and gas) to coexist in thermodynamic equilibrium.
Gibbs Phase Rule (non-reacting systems):
$$$P+F=C+2$$$
where
$$P$$
is the number of phases making up a system,
$$F$$
is the degrees of freedom, and
$$C$$
is the number of components in a system.
The triple point of a substance is where a specific temperature and pressure causes three phases (solid, liquid, and gas) to coexist in thermodynamic equilibrium. Based on the givens from the problem statement:
$$P=3$$
(water simultaneously exists as a gas, liquid, and solid)
$$C=1$$
(water is the only substance in the system)
Solving for degrees of freedom,
$$F$$
:
$$$F=C+2-P=1+2-3=0$$$
0
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