Originally Posted by the_chemist
You're right, mass is a much better method than pressure. We should get a list of different volume/pressure tanks together that has the masses of air they hold at different fills. "empty" would be when there is 200 psi or so.
You technically don't really need a list.
All of that should be calculated easily.
Unless you can't trust the published internal volumes of tanks.
*cough* Guerrilla Air *cough*
That's a topic for another thread.
"Empty" PSI will vary by marker. I set mine to about 600 for calculations.