The half-floating egg

4-6 year olds | half hour

A simple and easy experiment at home that helps your kids to understand the concept of density.

What You'll Need

  • Glass or jug (big enough for about a pint of water, or more)
  • Raw eggs
  • Salt


  1. Fill your glass/jug half-way with water.
  2. Dissolve some salt in the water.
  3. Drop your egg into the water and notice how it floats (this has to do with the density of salt water being more than the egg).
  4. Fill up the rest of the glass/jug with water that has no salt in it. The dense egg will sink through the un-salted water but not the salted water, both of which separate from each other and the egg ends up floating half-way from the top and bottom of the liquid.

Demonstrate to your child how it works by making a little game, in which you give you child a glass of salted water and you take a glass of un-salted water, and you drop your eggs in at the same time to see whose get to the bottom first. When their egg doesn’t sink you reveal that your water doesn’t have salt in it and that’s how the experiment works.

Careful not to break the eggs.

Tags: science

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