[Byrne]

How is important in society?  

[ytszazu]

Quite alot:

Such:

1: Gas tanks in your house.
2: Calculating heating gas flowrate/bill per month to your house.
3: Designing pumps, air blowers.

Maybe more...

Yong Tze Shoong

[killinchy]

If you are working at a pressure around 1 atm, you do not need the van der Waal's equation.  The ideal gas law will work just fine.  But... if you are working at high pressures, then you'd better use it.  BTW, the van der Waal's is not exact.  There is no perfect gas equation that works exactly under all conditions.

[Byrne]

Thanks, I really appreciate the help.

[Donaldson Tan]

VDW Equation is the simplest equation to describe real gas behavior.

It serves as a template for other more accurate equations to model real gas behavior. Such equations will include the Redlich-Kwong equation, the Soave Equation and the Peng-Robinson Equation of State.

It describes the behavior of real gas much more accurately than the ideal gas equation. The ideal gas equations works at low temperature (<500C) and low pressure (<5bar). At high temperature and pressure, real gas behavior deviates alot (in some cases, 100%).