Science KS1 / KS2: How to make ice cream - turning a liquid into a solid

Everyone loves ice cream! So Dr Brain and his team of young scientists would like to make their own.

To do so, they must think carefully about the temperature of their mixture if they want it to change state from a liquid to a solid.

Through this experiment the team discover that with some ice, a little salt and plenty of shaking, they can indeed get the mixture to the correct temperature and turn it into solid ice cream!

They learn that in order to freeze their mixture quickly they must use salt, which will speed up the freezing process by lowering the temperature to -10 degrees Celsius!

This short film is from the BBC series, Ultimate Brain: Mad Lab.

Teacher Notes

This could be used to introduce identifying states of matter (solids, liquids and gases) or how states of matter can change.

It could also be used to explain how temperature plays a part in each process.

Pupils could carry out the same experiment as in the short film, or use what they learn through watching it to carry out similar experiments (i.e freezing liquids to make ice-lollies).

Pupils could investigate at what temperature liquids begin to freeze. From this, discussions or further learning on reversible and irreversible changes of state could take place.

Curriculum Notes

These short films are suitable for teaching science at Key Stage 1 and 2 in England, Wales and Northern Ireland, and First and Second Level in Scotland.

More from Ultimate Brain: Mad Lab

How ingredients mix together to make new materials
What materials are waterproof?
Sorting materials to be recycled