P-V diagram , or indicator diagram , slope of P-V diagram , area of P-V diagram , ideal gas , internal energy , internal potential energy, internal kinetic energy , isothermal process , isothermal gas equation , work done by ideal gas during isothermal expansion ,work done by ideal gas during isothermal compression , slope of P-V diagram in isothermal process , adiabatic process , adiabatic gas equation , work done by ideal gas during adiabatic expansion ,work done by ideal gas during adiabatic compression , slope of P-V diagram in adiabatic process , isobaric process , isochoric process