The slope of isothermal and adiabatic curves are related as
isothermal curve slope = adiabatic curve slope
isothermal cure slope = γ x adiabatic curve slope
adiabatic curve slope = γ x isothermal curve slope
adiabatic curve slope = ½ isothermal curve slope
At a given point (P0, V0) on PV diagramdPdVisothermal =−P0V0 and dPdV adiabatic =−γP0V0