Finlay decided to make some Gloop. At first it didn’t really work because the measuring was not very accurate. The mixture was really runny so Finlay added some more cornflour. Once he mixed all the ingredients together completely the Gloop formed. It changed from runny to quite solid. When Finlay went to get a handful of Gloop it went quite hard. But as soon as he held it above the bowl it went runny again. The mixture looked shiny and felt quite cool to touch.
The science: Cornflour is made of lots of long stringy particles. They don’t dissolve in water but they do spread themselves out. This allows the gloop to act both like a solid and a liquid. When you roll the mixture in your hands or apply pressure to it, the particles join together and the mixture feels solid. But if it is left to rest or is held up and allowed to dribble, the particles slide over each other and it feels like
a liquid.
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