this should be easy. suppose i have a very large spaceship holding a tremendous volume of air at 14.7psi with a density of .0023769 slug/ft^3. i put a hole in the side of my spaceship that is 6" in diameter which vents to the vacuum of outer space. what is the velocity of the escaping air? i did this myself and came up with a value of about 14115 ft/min or 160 mph. can anyone confirm? if i am wrong, can you point out my mistake?