Re: It's a gas, man
My personal gas cylinder secured next to my lab bench is argon, analytic grade, 1500psi/100bar at full.
On an "off day" I gave my sequencing tech the full and empty tank masses, the speed of sound in argon gas, and challenged us to calculate the ideal delta-v of that tank as a mathematical exercise.
It was around 80mph/130kph. For a five foot tall steel pressure tank. We did not verify the calculation experimentally because we would rather have two jobs and zero new round windows.