What sinks in the pot: apple, potato, egg

What the experiment shows

Every food has its own density. Anything lighter than the same volume of water floats, anything heavier sinks. An old egg loses moisture and becomes lighter.

How to run it

1. Press “Run” and see where each item stops.
2. Select the water and make it salty: density 1.1.
3. What happens to the fresh egg and the potato now?

Questions to discuss

• Why does an apple float but a potato sink?
• How can water tell you if an egg is fresh?

The science

Density is the mass of one cubic centimetre. Water is 1 g/cm³, an apple about 0.8, ice 0.92, a potato 1.08, a fresh egg 1.07, an old egg below 1. Salt makes water denser, so more things float in it.

Try it at home

Put a raw egg in a glass of water, then stir in salt spoon by spoon until it floats.

What to change in the editor

• Add a carrot (density 1.04).
• Make the water thicker — viscosity 6.