The entropy of the universe has increased overall, even though it decreased inside the freezer temporarily. But our topic ...

Combine O'Sullivan's law with Rudolf Clausius' statement on the second law of thermodynamics: "The energy of the universe is constant. The entropy of the universe tends to a maximum," which means ...

Now, evidently, the Universe is very much out of thermal equilibrium; its entropy has apparently decreased. What's going on? In particular, if the Universe was once in equilibrium, how has it got ...

stating that “the entropy in almost all known regions (of sufficient size) of our universe either remains constant or decreases, although energy is dissipated (by escaping from the system in ...

The grandfather paradox is just one of the thorny logical problems that arise with the concept of time travel. But one physicist says he has resolved them.

Vanderbilt University physicist Lorenzo Gavassino isn't so sure this is as big an obstacle as time-traveler pessimists have ...

Can quantum systems become more disordered, as thermodynamics would predict? Yes, they can - if a proper definition of "entropy" is used. It is one of the most important laws of nature that we know: ...

Combine O’Sullivan’s law with Rudolf Clausius’ statement on the second law of thermodynamics: “The energy of the universe is constant. The entropy of the universe tends to a maximum ...