(I) Adiabatic process : No exchange of heat takes place with surroundings. ⇒ΔQ=0 (II) Isothermal process : Temperature remains constant ∴ΔT=0⇒ΔU=
f
2
nRΔT⇒ΔU=0 No change in internal energy [ΔU=0] (III) Isochoric process volume remains constant ΔV=0⇒W=∫P.dV=0 Hence work done is zero. (IV) In isobaric process pressure remains constant. W=P.ΔV≠0 ΔU=