Hello all, Would love for someone to help me get a solution for this. So, in essence I am trying to model a differential equation for the following scenario: (I am currently achieving this through Excel, but I'm certain a mathematical representation can make things more concise and efficient.) To give a run down: I have an initial Strut Volume and Pressure. I have calculated the Air Flow, Flow Rate. Now, the Volume added to the strut is just Flow Rate×delta time. But, the problem is that Air Flow and Flow rate change when the Strut Volume changes, and as a result the Pressure changes as well. So, apart from an iteration in Excel with small time-steps, I can't wrap my head to come up with another method. I know there's a differential equation that can be modeled around this. I just can't get the ball rolling. I would greatly appreciate if someone can help.