# Is the pressure of a gas proportional with the concentration of a gas?

Is the pressure of a gas proportional with the concentration of a gas?

Because you can also use the pressure instead of the concentration in the equilibrium condition.

• What do you call the "concentration" of a gas ? – Hippalectryon Mar 19 '16 at 18:04
• @Hippalectryon mol/l? – user2997204 Mar 19 '16 at 18:05
• I'm feeling generous: use the ideal gas law. – Todd Minehardt Mar 19 '16 at 18:07
• Assuming it follows $PV=nRT$, then if the temperature is fixed then indeed it's proportional to $n/V$ – Hippalectryon Mar 19 '16 at 18:07

Assuming your gas follows the ideal gas law, you have $PV=nRT$. Setting $c=\frac nV$ yields $P(c,T)=cRT$.
If the temperature is fixed, then $P(c)=(RT)c$ indeed tells us that the pressure of a gas is proportional to its concentration.