Wacky Science Wednesday: Digesting Fats

Oil and Water Experiment


Digesting Fats

This weeks experiment is on digesting fats. Bile in our liver helps us digest fats, oils and other nutrients that don’t dissolve in water.  In the experiment, soap works similar to bile. Sorry, no bile on hand to try.  At least any that is easy to access.

Materials Needed:

  • 2 glasses
  • water
  • 2 tbsp oil
  • 1 tsp dish soap


Step 1: Fill two glasses halfway with water.  Ask what they think will happen when you add oil to the water.  One boy thought the oil would sink because it was thicker than water and the others said it would float because it was lighter than water.

Step 2: Add about a tablespoon of oil in each glass . Observe what happened.

Emulsifying Water and Oil

Step 3: Take a guess at what will happen when you add the soap to one glass.  The boys all guess the the soap would make the oil mix into the water

Mixing Oil and Water

Step 4:  Add 1 tsp soap (bile substitute) to one of the glasses of water and mix it up well.

Step 5: Observe what happens to the oil in the cup with soap.

Step 6: Discuss what an emulsion is.  From dictionary.com , an emulsion is “A fine dispersion of minute droplets of one liquid in another in which it is not soluble or miscible.”

For a great explanation of emulsions, check this out, http://kitchenscience.sci-toys.com/Emulsions

Background Wrestling

This was going on in the living room while the big boys were experimenting.


1 comment to Wacky Science Wednesday: Digesting Fats

  • “Sorry, no bile on hand to try. At least any that is easy to access” Love it! In fact, I love the blog and the post. I’m looking forward to reading more about you and your boys and learning to embrace the noisiness and dirtiness of my own boys, age 3 and 5.

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