Hi, I have an excel spreadsheet that calculates the pressure inside a piston chamber, that is a function of time. I want to calculate the distance the piston moves, this is my situation. P=F/A, therefore force on piston = PA F = M(piston).a so ma = PA, a = P(t)A/m its all numerical in excel so i have a column of all the accelerations at the different pressures/time steps. By integrating a for velocity, I would just end up with v = PA/m and integrating that I would end up with s = PAt/m. Is this correct, it seems that something is not right in this method to get the distance moved by the piston from a numerical analysis?