Two solid bodies of equal mass and identical composition,
isolated from the surroundings and each other and kept initially at
temperature T1 and T2 are brought into thermal contact until they
attain thermal equilibrium with each other. Compute the amount of
entropy change of the universe in terms of T1, T2 and the heat
capacity Cp of each body, assuming the process to take place at
constant pressure exerted on them by the environment and show that
the entropy indeed increases during the process as expected