An oobleck, as we all know, a kind of colloid, in which solid particles are suspended in a liquid. It's a mysterious substance which is sometimes solid and sometimes liquid - and lots of fun to play with!
If you put pressure on it, it becomes a solid, and you can roll it into a ball between your hands:
If you take the pressure off, it becomes more liquid:
until it flows through your fingers:
So how do you make it? Simple! Put 2 cups of cornflour into a bowl and add a few drops of food colouring. Add 1 cup of water - SLOWLY! - while someone else mushes the mixture in the bowl by hand. Then have fun!
While you're at it, why not read Dr Seuss' Bartholomew and the Oobleck? Science, story-reading, and slimy fun, all in one!
1 comment:
Oooh we love this too... great idea! The best bit is you can sweep up the mess when it's dry :)
Post a Comment