[phymatter]

What do the V and P in the Vandervall's equation denote? i mean do they give V_real and P_real or V_ideal and P_ideal ??
i am a bit confused ,
 i know that V_real = V_ideal - nb
also P_real = P_ideal - an²/V²
am i wrong somewhere , all this is not fitting in well into the Vandervall's equation !
PLEASE 'HELP' !!!!!!!!!!!

[UG]

V= Volume P=pressure.
Just make sure you use the correct 'a' and 'b' values for a particular gas.

[Borek]

Real.

[phymatter]

also what about the V in an²/v² ?

[Borek]

Real.

[mbeychok]

phymatter:

First of all, I am surprised that no one has pointed out that the correct name of the equation is the van der Waal's equation.

You will find it useful to keep in mind that the van der Waal's equation is an "equation of state" and applies to real gases. Please read this article in the Citizendium online encyclopedia:

   Click here ==>  van der Waal's equation

and especially note this statement:Although the parameters "a" and "b" are referred to as "the Van der Waals constants", they are not truly constants because they vary from one gas to another; they are, however, independent of P, V and T. In other words, they are constant for the specific gas being considered.