"My own introduction to entropy was as an undergraduate mechanical engineering student. Neither I nor any of the other students knew anything about the molecular theory of heat, and I bet that the professor didn't either. The course... was so confusing that I...couldn't make any sense of it. Worst of all was the concept of entropy. We were told that if you heat something a small amount, the change in thermal energy, divided by the temperature, is the change of its entropy. Everyone copied it down but no one understood what it meant. It was as incomprehensible to me as "The change in the number of sausages divided by the onionization is called floogelweiss.""