How can you get a cold drink when you don’t have any in the fridge?
How to cool a drink quickly
What you need:
- A metal bowl
- Drink in a glass bottle
- Half fill the bowl with water and ice.
- Place the bottle in the ice.
- Add a handful to salt to the water and stir.
- Watch what happens to the bowl and drink.
The Science Bit
The salt lowers the melting temperature of the ice, making the water temperature drop below zero, so cooling the drink super fast. We call this supercooling.
Another way to demonstrate this is with a frost on a can experiment.
Can you design an experiment as a control condition? Maybe ice and water with no salt??
Can you record the temperature before and after adding the salt?
Does the temperature drop further if you add more salt?
What happens if you use a plastic bottle? Does it work as well?
If you use a smaller drinks container, does it cool faster?
Note: If you use a can be careful when you open it!