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 ...

In classical physics, entropy is the enemy, something that tears down what we build up. But in the quantum world, the chaos of entropy is the vitality of life.

This arises when the definition is first given with reference to the entropy of the working substance, because the non-available energy is not necessarily a portion of the energy of the substance.

This article considers the Gibbs paradox and its implications for three definitions of entropy in statistical mechanics: (i) the “classical” Boltzmann entropy (SB1); (ii) the modified Boltzmann ...

Brian Cox explains the concept of entropy and the arrow of time in this physics resource for Key Stage 3/4, GCSE and National 4 / 5 and Higher.

This innovative approach uses quantum relative entropy, a concept from quantum information theory, to describe the interplay between spacetime geometry and matter.