• The ideal gas is a mathematical model of a gas. The ideal gas consists of massive particles without volume. Those particles don't interact in anyway with each other except for elastic collisions, meaning that they can exchange energy and momentum. We don't include any quantum effects either. (And of course we keep physical relations out that we don't know yet.) With these simplifications we can lay down the ideal gas law: pV=nRT p ... pressure V ... volume n ... amount of moles R ... molar gas constant, R=8,31441 J/(mol*K) T ... absolute temperature If you want to be more precise, you need the Van der Waals equation (p + a*n^2/V^2)*(V - nb)=nRT a and b are empirically found "a" represents intermolecular interactions "b" represents the volume

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