What Is Entropy? A Measure of Just How Little We Really Know. | Quanta Magazine

We can’t keep track of the motion of all the air molecules in a room, so we take averages in the form of temperature and pressure. We progressively lose track of microscopic details as systems evolve into more probable states, and this relentless trend materializes as the flow of time. “The time of physics is, ultimately, the expression of our igno... See more