### Antoine Equation

Since the Clausius-Clapeyron equation assumes ideal gas behavior
for the vapor it is not strictly accurate for all fluids.

An empirical relation is often used that exploits the same
general form of equation ...

##### Definition:

The **Antoine Equation** is an empirical relation
for the saturation pressure as a function of temperature that is
loosely based on the Clausius-Clapeyron relation.

$\ln P = A - \frac{B}{C+T}$

##### Note:

The units on this equation make no sense, so we need to be
careful with the constants A, B, and C.

##### Outcome:

Use the Antoine equation to relate T and P for pure species
phase equilibrium

##### Outcome:

Explain the relationship between the Clausius-Clapeyron equation
and the Antoine equation

##### Test:

Use the Antoine equation to prove that the normal boiling point
of water (which is pretty non-ideal) is 100C.