Non-ideal gas Memes

When your professor says "these equations are essentially the same" but the exam requires you to know both versions. The Van der Waals equation vs. its "cooler" molecular form with Boltzmann constant is like meeting your friend before and after they discovered sunglasses and lowercase letters. Both describe non-ideal gas behavior, but one will absolutely wreck your exam if you mix them up. Physical chemistry professors get a strange pleasure watching students panic over notation differences.