Thick and sticky fluids

Viscosity is a property of a fluid on the molecular scale and is a measure of the strength of the internal friction between fluid particles. What this means in practice is that the thicker and stickier the fluid, the higher its viscosity.

The task that you have been set by St John’s Maths Tutor Dr Tom Crawford is to order the six fluids below by their viscosity, lowest first.


For clarity the fluids shown in the pictures are written below.

  1. Blood
  2. Water
  3. Air
  4. Peanut Butter
  5. Tomato Ketchup
  6. Honey


Click here for the answer.

Teachers we want to hear from you too if you want to get involved and set some questions of your own – email


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