Food can spoil right away if the environment is favorable for bacterial growth. If you want to teach kids about how bacteria grow and the importance of refrigeration, this is the science project to for you.
What you need:
- Balloons
- 2 to 3 glass soda bottles
- Yeast
How to do it:
- Get the glass soda bottles.
- Put a teaspoon of yeast in each glass bottle.
- Fill each one halfway full with warm water.
- Attach a balloon on top of each bottle. Place one bottle in the fridge. The other one goes on the kitchen counter beside the oven. The yeast is activated if the balloon blows up.
The balloon on the kitchen counter will blow up. This means that the yeast has grown dramatically. The balloon in the fridge will not blow up at all. This is because refrigeration prevents any microbial growth.
