Freezing lemonade bottles

18 March 2007

Ingredients

A small bottle of unopened fizzy drink (carbonated). It is a good idea to remove the label.

A large bowl of ice - you can bury the bottle in

Water

Salt - several tablespoons

If you have one

A thermometer

Instructions

1- Add some water to the ice so it is about half covered in water

2- Add the salt to the ice (if you have a thermometer this should bring the temperature down to about -4°C

3- Bury the fizzy drink bottle in the ice

4- Wait 20-30mins - if the drink freezes you have waited too long.

5- Open the bottle, watch what happens

Result

The bottle should turn to slush in a few seconds in front of your eyes.

Explanation

Before you open the bottle of lemonade or beer there is lots of carbon-dioxide (CO2) dissolved in the lemonade. If you dissolve carbon-dioxide in water it reduces the freezing point (in the same way that salt does. So you can cool the lemonade down to -2 or -3°C without it freezing.

However when you open the bottle you release the dissolved carbon-dioxide increasing the freezing point and creating lots of little bubbles.

A closed Lemonade Bottle An opened Lemonade Bottle

Freezing point

-3°C

Freezing point

-0.5°C

    The lemonade is now below its freezing point, and there are lots of bubbles for the ice crystals to start on, so it freezes in front of your eyes!

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