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THE MAGIC EGG

Test if salt water is more dense than fresh water

Suitable For

Grade 3

Difficulty

1

Time Required

 <1 Hour

Supervision

Advised

What’s it about?

‘Density’ is a physical property that all matter possess and can be used to compare two substances that have the same ‘volume’, but their ‘mass’ is not the same. Salt water is more ‘dense’ than fresh water, and for the same reason it is easier to float a boat in the sea. Test this scientific fact in the following experiment:

Topics covered

Density, Floating

What will I need?

  • 2x DRINKING GLASSES
  • TAP WATER
  • TABLE SALT
  • 2x EGGS

Procedure (Method)

Unfortunately, this section is only available in the e-book version of the project.

How does it work?

Unfortunately, this section is only available in the e-book version of the project.

This science experiment works because when the salt is added to one of the glasses with water, the solution’s density is increased. The egg will float in the salt water solution because it has a lower density than salt water. On the other hand, the egg will sink in the fresh water because it is denser than fresh water.

When the two liquids are carefully added together, they do not mix right away. The egg sinks through the fresh water and come to rest or ‘floats’ on the salt water solution (and seem to be suspended in the middle).

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