Water inside water bottle froze up right after I removed it from the freezer

Question

So here’s what happened, I put water bottles inside my freezer, and looked like it was still liquid inside. But when I removed it, I saw it freezing from top to bottom (not completely frozen, but hardened). What exactly happened?

In: 479

Answer 1

Supercooling, as others have said. I’ve had a similar thing happen when I left a bottle of water in my car during freezing temperatures. Pick up the bottle and give it a shake and watch it instantly turn to slush.