Classical thermodynamics problem.

The discussion revolves around a thermodynamics problem involving two identical masses of water at different temperatures, T1 and T2, and the calculation of the global increase in entropy after they reach thermal equilibrium. The initial formula proposed for entropy change was incorrect, leading to confusion. A key point is to consider the equilibrium temperature and the entropy change for each mass of water. After some guidance, the participant realized the correct approach to solve the problem. The conversation highlights the importance of understanding thermal equilibrium and entropy calculations in thermodynamics.