Why did a bottle of water freeze...

[Tango13]

After I took it out of the icebox?

I put a 500ml plastic bottle of water in the icebox of the fridge at about 4pm when I took it out at 6pm it was cold but still liquid.

The top was stiff to undo but when I undid the top ice formed at the top and rapidly made its way to the bottom leaving the bottle completely frozen solid.

[Tango13]

Cheers for the answers

I've also noticed that water that has been through the filter jug prior to being chilled freezes much faster when the top is cracked than plain tap water.