Though a cornerstone of thermodynamics, entropy remains one of the most vexing concepts to teach budding physicists in the classroom. Physics teachers designed a hand-held model to demonstrate the ...

Nonequilibrium Thermodynamics: The study of systems that are not in thermodynamic equilibrium, focusing on the flows of energy and matter and the production of entropy.

Running in reverse They found that the change in entropy was negative over time intervals of a few tenths of a second, revealing nature running in reverse.

As physicists extend the 19th-century laws of thermodynamics to the quantum realm, they’re rewriting the relationships among energy, entropy and information.

One thing to keep in mind through all this is that the concept of entropy was introduced by mathematician who was trying to express the second law of thermodynamics in an equation.

Axel Kleidon, Non-equilibrium thermodynamics, maximum entropy production and Earth-system evolution, Philosophical Transactions: Mathematical, Physical and Engineering Sciences, Vol. 368, No. 1910, ...

A plant, for example, absorbs extremely energetic sunlight, uses it to build sugars, and ejects infrared light, a much less concentrated form of energy. The overall entropy of the universe increases ...