Holiday fun

How to make slime?

Use the following recipe to make cornflour slime or Oobleck (from Dr Seuss book Bartholomew and the Oobleck).

Materials

  • large mixing bowl
  • large spoon
  • 2 cups of cornflour
  • 2 cups of water
  • food colouring

Method

  1. Add 2 cups of water and a few drops of food colouring to the mixing bowl
  2. Gradually add the cornflour until you achieve a smooth consistency. It should flow smoothly when you stir very slowly but should be difficult to stir quickly.
  3. Roll up your sleeves and try the following:
  • Drop your hands quickly into the slime, then slowly lower your hands into it.
  • Hold a handful in your palm - what happens?
  • Move your fingers through the mixture slowly, then try moving them fast.

This slime is what we call non-Newtonian fluid - it's a fluid that can change it's thickness (viscosity). Shampoo, pastes and glues, gelatine and quicksand are all non-Newtonian fluids.

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