I am going to be running some experiments with refrigerants. They will be at various temperatures and pressures. I will then be doing some modeling of certain phenomena. I would like to be able to quantify whether the ideal gas model is reasonable during certain stages of the experiment. My first instinct is to look at the compressibility factor Z of the different refrigerants. I am looking for someone to confirm that my methodology is sound here: 1) I have data for the same experiment except it was run with other vapors as the working fluid, like methane and the like. 2) Looking at this data, I can look at the pressures and temperatures at various stages in the experiment such as the initial conditions and final conditions (since T and P both increase from start to end). 3) Using the temperature and pressure of these other working fluids, I can fix the stated of the current working fluids (as a preliminary estimate). 4) I can then calculate the compressibility factor Z at these states for my current working fluid. This would give me a starting point to make a judgement call. Sound reasonable? I could just run the experiment with the current working fluid, however I can only retrieve a pressure history. I believe that I can retrieve temperature data at the initial and final states though. Just not the intermittent temperatures. Sorry, just kind of "thinking out loud" here.