Well, why is it less? Well, when the molecule in the real gas travels it's attracted by other molecules. And that means if it's attracted by other molecules if it's pulled by the other molecules it will hit the wall with less force and therefore, a smaller pressure will result. That means for ideal pressures, ideal pressures are higher than real pressures. Likewise, let's examine the conditions for volume of ideal versus volume of real. Now, the volume of ideal is less than volume of real because when you're taken into consideration the volume of real gases you're taking into consideration the volume of the molecules.