X Check significant figures and critical properties. You may wish to experiment with the compressibility charts a bit to make sure that you understand them. For example, you might check consistency of Pr,Tr, and Vr. A volume of 1.4L of ethylene vapor at 32.5C and 9.6atm is heated at constant volume until it reaches a temperature of 179.8C. Jse the theory of corresponding states and the appropriate compressibility-factor chart to estimate the final pressure of the volume of ethylene. atm