[Verse] Z is P V over n R T Ratio of real to ideal If the gas behaved perfectly Z would always equal one [Chorus] Z equals one, ideal case Nothing pushing, nothing pulling Z below one, attraction stays Z above one, pushing away [Verse] At low pressure, far apart Interactions fade away Z goes back toward one again Ideal limit on display [Final Chorus] Z equals one, ideal case Nothing pushing, nothing pulling Z below one, attraction stays Z above one, pushing away