Thermodynamics Laws & Entropy
📋 What it is
Entropy measures disorder; the universe’s total disorder always tends to increase over time.
🗣️ Coach says
Entropy is a measure of how spread-out or disordered energy is. The second law, deeper form: the total entropy of the universe always increases. That’s why a hot drink cools (energy spreads to the room), why things mix but never un-mix on their own, and why time seems to run one way.
🧠 Memory hook
Entropy = disorder/spread-out-ness. Total entropy of the universe always increases.
😂 Giggle
What did the hot chocolate say to the cold hands?
"Let me conduct myself properly and warm you up!"
😲 Whoa!
Entropy is why you can stir milk INTO coffee in a second but could stir forever and never separate it back out — nature strongly favours the mixed, spread-out state.
✅ Quick check: Why does a hot cup of cocoa always cool down and never spontaneously heat back up?
Say your answer out loud first — then reveal.
Because heat spreads out to increase entropy (disorder); energy concentrating back on its own would decrease it.
The second law: total entropy increases, so heat disperses.
🧪 Try it! (2 minutes)
Drop food colouring in water and watch it spread — it never gathers back; that’s entropy rising.