How Can You Tell The Age Of An Egg Without Cracking It Open?

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Author: Sofia PC

Grade Level: 4th - 6th; Type: Physical Science


In this experiment, students will learn how to tell the age of an egg without having to crack it open.

Research Questions:

  • What causes objects to float and sink?
  • How do boats float?

Buoyancy is when things float or sink in a liquid. The lighter things are, the more they float. If they are heavier, they sink. In fact, boats float because of this concept.


  • Eggs
  • A large container you can use to hold some water and an egg

Experimental Procedure:

  1. Buy a dozen of fresh eggs at the store.
  2. Label one egg with a marker on the shell just so you will use the same egg in 2 weeks.
  3. Submerge this egg in a container filled with water. What happens? Jot this down.
  4. Save this egg (do not eat it!) an repeat the previous step in 2 weeks and in 1-2 month, what happens?
  5. You can do this experiment with more than one egg for accuracy.
  6. Record your results.

Terms/Concepts: Buoyancy; Density; Mass; Weight


Greene, Brian (2000). The Elegant Universe: Superstrings, Hidden Dimensions, and the Quest for the Ultimate Theory. Vintage. ISBN 0-375-70811-1.

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