Why Entropy Feels Confusing (And How to Fix That)

Most courses introduce entropy as "disorder", which sounds intuitive but quickly falls apart under scrutiny. A better mental model: entropy measures the number of equivalent ways a system can be arranged.

A gas spread evenly across a room has far more equivalent microscopic arrangements than a gas squeezed into one corner — that is why it naturally spreads out. Nothing is "seeking disorder"; it is simply far more statistically likely to end up in a spread-out state.

Once you think in terms of probability rather than vague notions of messiness, the second law of thermodynamics stops feeling mysterious and starts feeling obvious.