>Take an empty closed box (wood, metal, anything solid), 500 liter >volume, take a compressed air cylinder, 500 liter volume @ 10PSI, >connect both and empty the cylinder into the box. The box will end up >with 5PSI, right? Simple formula where you use both volumes and both >pressures. Even better yet, take a large metal container and place a known quantity of boiling grease in the container. Then place all the chickens in the said container, catch and measure all the overflow. After you finish your calculations, call some friends and have dinner. Jc. Jc.