1. The problem statement, all variables and given/known data I have a problem: So one tank is pressurised and then a pipe connecting this tank to a smaller one is opened so air can flow into the smaller tank. You then wait for the pressure to settle and read some pressure for each cylinder values. I need to find two ways to measure the volume ratio of the larger tank to the smaller one. I think I've got one but not another 2. Relevant equations 3. The attempt at a solution I think you can consider it an isothermal process as the gas temp stays constant and this results in the equation to get V1/V2 = P2/P1. But I'm really stuck on how to find another way to do it. Could anyone offer me a hand? Thanks so much!