PV=nRT,Y=CP/Cy nR nR W=( 6T0 =-Cv 1- =-CA()=-Vn 16 16 W=( 1− 1 ) (P2 V2 - P1 V1 ) PV=nRT, γ=CP / CV W =( V P C C nR 1− )(T2 -T1 ) V P C C nR 1− =-Cv = - Cv(T2 -T1 )=-△U