ideal gas is a composition of randomly moving particle which obey the ideal gas law . 
a gas generally behaves like an ideal gas at high temp. and low density , but this concept tends to fail at low temp . 
and the ideal gas law states that the gas said to be ideal if it obeys all kinds of gas laws like boyle law , charles law , avogadro law , at every temp and pressure condition . 
example – oxygen , nitrogen and carbon oxide , are nearly ideal , which is present in atmosphere . 
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ideal gas is defined as the a hypothetical gas whose molecules occupy negligible space and have no interaction.
IDEAL GAS EQUATION =>  PV=NRT
examples:- oxygen,nitrogen,Co2
						

							Ideal gas is the gas whose molecules occupy no volume and have no interaction between them.with the help of Boyle s Law ,Gay lussac s Law ,Charles Law and Avogadro s law we get PV =nRT. where P is pressure V is volume n is number of moles R is gas constant and T is the temperature. No gas is ideal but some like oxygen and carbon di oxide are near to ideal.