Keywords: P-v diagrams elementary evolutions of perfect gas.svg en Four elementary evolutions constant pressure constant temperature constant entropy constant volume of a gas represented on a pressure-volume diagram When the evolutions are reversible the integration of -p dv in a closed system or of v dp in an open system represents the work done by the fluid 2013 own Olivier Cleynen other versions cc-zero Pressure-volume diagrams SVG physics Uploaded with UploadWizard Isochoric process Isentropic process Isothermal process Isobaric process |