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It has been a lot of years since college physics and my scuba classes, but my guess is that Boyle's law comes into play here: PV=nRT

So the variables are Pressure, Volume, Temperature, and I forgot what the R is along with a constant "n" for the fluid. Pedro is probably better at this stuff, and he might be able to help, but in the meantime, Google Boyle's Law and see if it gets you anywhere.

I never put a lot of stock in compression tests other than to tell you that you might have a problem in a specific cylinder. I would use a leakdown tester to see what exactly the problem was - leakage around the valves or the rings.

It has been a lot of years since college physics and my scuba classes, but my guess is that Boyle's law comes into play here: PV=nRT

So the variables are Pressure, Volume, Temperature, and I forgot what the R is along with a constant "n" for the fluid. Pedro is probably better at this stuff, and he might be able to help, but in the meantime, Google Boyle's Law and see if it gets you anywhere.