Quantum gas goes below absolute zero

[reteachinwi]

7. Entropy, I think

Entropy is a measure of randomness. Gasses, like water vapor, have converted the energy added into entropy as the gas molecules are arranged more randomly in relation to each other than they were in a liquid or solid state. I don't know what quantum materials are, but apparently when more energy is added the randomness decreases, in other words, the lattice structure is more stable, more orderly if you will, than previously. So it is "cooler" than before. Maybe a DUer with more physics ability than me can confirm or correct this.