Experiment 10:

The effect of salt water

This experiment will demonstrate that all substances which have a lesser density than the salt water will float on it

A large glass
An egg
Table salt
A teaspoon
Water
A dessert spoon

Half fill the glass with water. Then, using the dessert spoon, carefully put the egg in the water

Take the egg out of the water. Add 10 tablespoons of salt, and mix until it is dissolved. Now you have made salt water

The egg sinks to the bottom of the glass

Put the egg in the water once more

What happens?

The egg floats

The egg remains suspended in the centre of the glass
The egg is more dense than the water, and so it sinks. The salt water is more dense than clear water, and therefore makes it possible for the egg to float. In the last stage of the experiment, the clear water floats on the salt water because clear water has a lesser density. So the egg stays in the middle, because it has more density than the clear water but is less dense than the salt water.

Take the egg out of the water again. Slowly pour more water into the glass until it is full.
Put the egg in the water again