Grade 4 Science Experiment 2 - "Find the Bacteria Hiding in your Milk"
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Purpose:
The purpose of this science fair project is to determine how much bacteria is present in the milk that you drink. It is necessary to find the amount of bacteria present in your milk to make sure that the milk is safe to drink. You can use the "Methylene Blue Test" to determine the amount of bacteria in the milk. Adult supervision is required.
Hypothesis:
Milk with the highest number of bacteria will turn from blue to white the fastest.
Variables:
Test tube with methylene blue
Time
Materials Needed:
- Methylene Blue Solution (Ask your science teacher for this solution)
- Refrigerated milk
- Two calibrated test tubes that have rubber stoppers
- Two medium size glass jars
- Two-hole test tube stand
- Thermometer
- Calibrated (cc) medicine dropper
- Tongs
- Watch
- Hot plate
- Saucepan
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