P4A Science experiment

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We have been learning about microorganisms. This week we did an experiment with yeast. Here is the information if you want to do the experiment at home.

Resources:

  • Small bottle (with lid)
  • 10g fresh or dried yeast
  • 30ml warm water
  • 10g sugar
  • Thermometer
  • Balloon

Activity:

Yeast is a living organism that needs food (carbohydrate) and oxygen to respire. This can be demonstrated using simple materials.

  1. Warm the water to around 38°C (check with a thermometer).
  2. Pour the water into the bottle.
  3. Add the yeast and sugar.
  4. Secure the lid and shake the bottle to mix the contents.
  5. Remove the lid and stretch a balloon over the neck of the bottle.
  6. Put this in a warm place.
  7. Observe the bottle over the next hour. The balloon should slowly inflate.

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