This doesn't have to be exact. so if a some what simple formula might do the job, great. I am requesting a formula for: If I had a 100 ft tall cylinder. 2ft wide and 2ft long at the top and bottom equally. A square cylinder. I dropped a 25 pound weight from the top and it free fell loosing no air, at sea level. How far would it drop towards the bottom before it stopped and held its own weight and how many pounds pressure would the compressed air be left in the cylinder? This is not homework I am a vet senior citizen with a curiosity. Thank you for your help ahead of time.