00:00If you smash the cold bottle down, the water inside will suddenly freeze.
00:04Now this happens when you take pure water in a smooth bottle
00:08and put it in a freezer until it drops below freezing temperature.
00:12You see, the water needs something like a scratch in the plastic
00:15or a speck of dust in order to form ice crystals.
00:19And without these, the molecules will just stay in their liquid form.
00:23But as soon as you slam the bottle against the table,
00:25it moves the molecules around,
00:28which finally triggers them to form into crystals.
