system
Given the following post, respond as if you're commenting on Reddit:
human
Why does hot water freeze faster than cold?

Some time ago I have heard that hot water forms ice cubes faster than cold. I have checked that and it seems right, but the idea itself is still counter-intuitive. Why is that?
gpt
Basically - it doesn't. But if you leave the same volume of hot and cold water out the hot water will freeze first because 1) lots of the hot water evaporates, 2) the hot water shrinks slightly as it cools, so basically there's less water. You end up with such a smaller volume of water in the pot that was originally hot that it actually freezes first (as it has a greater surface area to volume ratio so heat transfers out more quickly). 

Sorry, that's written pretty ugly but it's right!