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WASHINGTON (WUSA9) -- When the weather is this cold, it gives First Alert meteorologist Erica Grow a chance to have a little bit of fun with it. You can do this one at home, too.

Take an unopened bottle of soda outside and let it sit in the bitter cold for a couple of hours. Make sure the soda is in a spot where it won't tip over or get jostled around. The colder it is outside, the faster the process will take place. The soda will still look like liquid, until you open the top. Then, the soda inside starts to crystallize. In a matter of seconds, you have a slushie in a bottle.

This works because the pressurized liquid and gas in the bottle become "supercooled" when the temperature is below freezing. The pressure is too high inside the bottle, which prevents the ice crystals from forming, until the pressure is released by opening the cap. Once the pressure is released, the supercooled liquid starts freezing.

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