There are some cold Florida nights that I run in that have a density altitude equivalent of 1000 feet below sea level. But there are also some hot muggy nights that I run that have a DA of over 1000 feet. It really shows in your trap speed. The ET is more skill related but the DA will effect that too. Sent from my iPhone using Tapatalk
Using Boyles Law, the gas mollycules at 1k ft are gonna be a skosh further apart than at ground zero. How much further depends on some other shit and how good your ruler is..