PV=nRT this is the ideal gas eqation . no gas can be an ideal gas. but we use this equation in almost all types of problems. how can we consider some gas as an ideal gas? all gases are real gases,how can we use this eq for real gases? so are we actually using d wrong formula? if this is the case then this gas equation doesnt have any meaning at all.then why are we having such an eq?
Dear Sukanya Roy,
Ideal gases does not exist but few gases like Hydrogen and helium and some what nitrogen behave ideally at high T and low P.
By considering real gas as ideal (at high T and low P) the different law have been put forwarded and by their combination gas law has been proposed.
The defination ideal gas is based on few points like; gases do not have attraction and repulsion, follow ideal gas equaion at all ranges of T & P, can not be liquified or difficult to liquify. These are the main classes for defining ideal gas.
So hypothetically the law have been proposed; when the same law has been followed for real gas some error obtained in that formula.
After that vander waal equation was prepared for the real gas which covered maximum gases.
Real gases occupy volume and have attraction as well as repulsion between two molecles.
So the logic is simple if you are getting exact result for your experiment by following real gas equation the gas is ideal & if not then the gas is real.
Regards
Ideal gases does not exist but few gases like Hydrogen and helium and some what nitrogen behave ideally at high T and low P.
By considering real gas as ideal (at high T and low P) the different law have been put forwarded and by their combination gas law has been proposed.
The defination ideal gas is based on few points like; gases do not have attraction and repulsion, follow ideal gas equaion at all ranges of T & P, can not be liquified or difficult to liquify. These are the main classes for defining ideal gas.
So hypothetically the law have been proposed; when the same law has been followed for real gas some error obtained in that formula.
After that vander waal equation was prepared for the real gas which covered maximum gases.
Real gases occupy volume and have attraction as well as repulsion between two molecles.
So the logic is simple if you are getting exact result for your experiment by following real gas equation the gas is ideal & if not then the gas is real.
Regards