For isothermal processPV = constant⇒PΔV+VΔP=0⇒VΔV=P−ΔP⇒ΔV=−(PV)ΔPFor adiabetic PVγ= constant⇒PγVγ−1dV+VγdP=0⇒dV=γP−V(dP)Magnitude of PV is greater than γPVSo, volume falls more rapidly in isothermal.2nd statement is the process description of the isothermal and adiabatic