# How To Find Work If I have Pressure and Volume

by EngNoob
Tags: pressure, volume, work
 HW Helper P: 1,662 If you are given an index of 1.4, you are probably supposed to be looking at an adiabatic process for a diatomic gas. So you don't want to use the work formula for an isothermal process. In a (reversible) adiabatic process, the relationship is $$P_{1}V_{1}^{\gamma} = P_{2}V_{2}^{\gamma}$$, where gamma is the adiabatic index (in your case, $$\gamma = 1.4$$). In such a process, Q = 0 ; you would still calculate work by integrating P dV between the two values for volume, but the result is now a little more complicated...