ⅠIsothermal compression: A compression method that keeps the temperature constant when the gas is compressed.
Ⅱ Adiabatic compression: A method of compression in an adiabatic state that neither heats nor removes heat from the outside.
Ⅲ Polygonal curve compression (compression method actually used): It is a compression method that dissipates part of the heat generated and exchanges heat with the outside, which is different from isothermal compression and adiabatic compression.
