# Diatomic ideal Gas

1. Mar 31, 2013

### Abigale

Hi,
I try to understand a cycle process with an diatomic ideal Gas.

Question:
Is it possiblie to use the ideal gas law:

$pv=NkT$

for the diatomic gas?

I thought it is just for monoatomic.

Thx
Abby

2. Mar 31, 2013

### Staff: Mentor

Yes, an ideal gas need not be monatomic.

3. Mar 31, 2013

### Philip Wood

DrClaude is right, of course. Almost all the molecules (O2 and N2) in air are diatomic, and at very low densities air obeys pV = nRT more and more closely.

Last edited: Apr 1, 2013