You have a cylindrical chamber with a 5cm ID and 55cc capacity filled to 4,000psi of air at 70*F and want to released the air threw a tube of .5cm ID. What's the initial velocity (in fps please) as the air leaves the chamber's end directly threw the .5cm tube? What's the initial velocity as the air leaves the same chamber end if it's shaped like a funnel for say half the length of the chamber out the .5cm tube? I don't know what it's called but the funnel is horn shaped. No real accuracy is required as it mostly a hypothetical question. Thanks, Ed.