By Aaron Davidson
I know I’m running the risk of creating an article that reads like a textbook, but I feel strongly that this is the most common area of mistaken inputs when making ballistic calculations. I want to systematically explore air pressure topics so that we all have common nomenclature and basic understanding of measurement and reporting systems. We will start with a general discussion of air pressure, definition of terms, measurement devices, and then finish with some alternative ways to use pressure data when calculating ballistics.
Lets start by defining atmospheric pressure as the force per unit area (eg psi) exerted o...