Science Fair Project:

How Much Does Fat Weigh in Water?

4.2 based on 19 ratings

Research Questions:

  • Can you think of any foods that are rich in fat?
  • How much does fat weigh?

Fat is largely insoluble in water, which is why it tends to float and “cake” on top of it. So how would you remove grease and fat from dishes, bowls, pots, and pans? With dishwashing liquid! Dishwashing liquid is a basic solution and acts as a “connector” between molecules of fat and water that normally repel each other. In this experiment, you'll try to measure how much extra weight fat can add to water.


  • Some fatty liquid, such as the water your mom used to steam the chicken for dinner last night
  • A spoon
  • A kitchen scale
  • Pen and paper for notes

Experimental Procedure

  1. If you already have a fatty solution available, then we will go to the shortcut. But if not, you simply have to steam or boil some water, add some chicken skin or pork fat inside and let it simmer for 10-20 minutes.
  2. Take out the skin/fat and then let the remaining liquid cool at room temperature or in the fridge.
  3. After cooling, you should be left with a cakey/chalky white “goo” on the surface.
  4. On a kitchen scale, weigh the fatty liquid. Remember to subtract the weight of the pot/container from your total measurement.
  5. Using a spoon, scoop all the white “goo” off of the surface and throw it out.
  6. Now weigh the liquid again. Does it weigh more, less, or the same as before?
  7. Record your results.

Suggested Chart



With Fat

Without Fat

Terms/Concepts: Lipids; Fat; Fatty Acid; Chemical structure; Essential Oils; Water; Density


Author: Sofia PC
Disclaimer and Safety Precautions provides the Science Fair Project Ideas for informational purposes only. does not make any guarantee or representation regarding the Science Fair Project Ideas and is not responsible or liable for any loss or damage, directly or indirectly, caused by your use of such information. By accessing the Science Fair Project Ideas, you waive and renounce any claims against that arise thereof. In addition, your access to's website and Science Fair Project Ideas is covered by's Privacy Policy and site Terms of Use, which include limitations on's liability.

Warning is hereby given that not all Project Ideas are appropriate for all individuals or in all circumstances. Implementation of any Science Project Idea should be undertaken only in appropriate settings and with appropriate parental or other supervision. Reading and following the safety precautions of all materials used in a project is the sole responsibility of each individual. For further information, consult your state's handbook of Science Safety.

How likely are you to recommend to your friends and colleagues?

Not at all likely
Extremely likely