Need help on basic fluid volume calculation!! Hey guys, I need some help calculating a volume. Ok, so say we are given a pressure vessel with an 88ci volume @ 4500psi which is then regulated down to 100psi and we open a valve for 0.1 second. How many cubic inches of air would be released? The reason why I am asking is because I am developing a pneumatic shift system for a formula car. And I need to know how many shifts we can get per tank of compressed air. Im not sure as to which formula to use but I figure someone here would. If you need any other information just let me know. Thanks!!!!!!