# What is an Equation of State ?

An

## Equation of State

(EOS) is an equation that relates the pressure, temperature, and the molar volume of a substance.
You already know a few things about one EOS.

You probably call it the Ideal Gas

We call it the

You probably call it the Ideal Gas

*Law*.We call it the

### Ideal Gas Equation of State

, because it is definitely NOT a law because it does not always accurately describe the relationship between P, V and T.
In this lesson, we will discuss the Ideal Gas EOS and a graphical EOS called the

## Generalized Compressibilty Factor

EOS.© B-Cubed, 2003, 2005, 2006, 2014. All rights reserved.

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