Ice cream is basically droplets of fat from milk suspended in millions of tiny crystals of ice, fluffed up with tiny pockets of air.
This activity shows you how to make the right mixture, then make it cold enough to create those ice crystals without the aid of a freezer. It also reveals how salt and ice make a chilling combination.
KS2 Science: Properties and changes of materials
KS3 Physics: Matter – physical changes
SMG Learning Activities – Instant Ice Cream (PDF Document)