Mystery #4Tier 1heat / energy
Why does a hot drink always go cold (and a cold drink warm up)?
Leave a mug of hot cocoa on the table and, without fail, it cools to room temperature. Leave a glass of cold juice next to it and that creeps up to room temperature too. They drift towards the same point from opposite directions, and you never once see a lukewarm drink suddenly get hotter on its own. Why does heat always travel one way?
Your guess
What's your hunch about why a hot drink cools down and a cold drink warms up, until both match the room?
There's no single magic word to type, have a go in your own words, then reveal the answer to see how close you got.
Make a guess to unlock the hints and the answer.