This is a subjuctive question. hinnce you have to write your answer in the Jexthfleld given below. Five kilogram of air is heated reversibly at constant pressure from an initial state of 450K and 3 bar until its volume tnples. Catculate W, Q. DU, [6] This is a subjuctive question. hinnce you have to write your answer in the Jexthfleld given below. Five kilogram of air is heated reversibly at constant pressure from an initial state of 450K and 3 bar until its volume tnples. Catculate W, Q. DU, [6]