Thank you for leaving this wonderful technical comment. From what I have studied the formula ds = dQᵣₑᵥ / T is the differential definition of entropy in classical thermodynamics. This mathematical expression connects the heat exchanged in a reversible way with the increase in disorder of the system. I hope I said it well because it seems to me that you know these topics better than me. I am someone who studied these things in the past, but it seems to me that you use these concepts daily in your work, is that right?