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 ​γPV​​So, volume falls more rapidly in isothermal.2nd statement is the process description of the isothermal and adiabatic