T1=273+23=296K,P1=2.128*10^6pa
T2=T1-20=276K,V1=V2
P1/T1=P2/T2
P2=P1*T2/T1=2.128*10^6*276/296=1.984*10^6pa
P2-P1=0.144*10^6pa
T1=273+23=296K,P1=2.128*10^6pa
T2=T1-20=276K,V1=V2
P1/T1=P2/T2
P2=P1*T2/T1=2.128*10^6*276/296=1.984*10^6pa
P2-P1=0.144*10^6pa