Gases that behave the way molecules in the gas phase behave in the real world. The molecules in real gases have volume and mass, collisions between these molecules are not perfectly elastic and real gases have a condensation point.
Under standard temperature and pressure, far from a gas' condensation point, the behavior of real gases are similar to ideal gases. As a result, many real world situations can be explored using the idea gas laws even though real gases do not exhibit all the characteristics of ideal gases.
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