Why does it float?

 ★ If you drop an egg into water, egg usually sinks to the bottom, but what if you add salt into water? The egg will start to float slowly. This experiment can be explained by the differences in density. When you add salt into water, then salt water becomes denser than the normal water. And denser water is floating goods easier than normal water. This can be also found in real life, which is sea water. Seawater makes you to float easier in river or lakes.

★Time: about 5minutes (set up and cleaning included)

★Cost: $0 (if you have all the materials and water in the house)

★Area of Science: General Science

★Learning Objectives: Students can understand the differences in density of liquids.

★Materials :

1. One egg

2. Water

3. Salt

4. A Tall Drinking Glass / Transparent water bottle

★Procedure:

1. Pour water into the glass.

2. Gently drop an egg into glass and watch what happens

3. Stir in lots of salt (about 6 tablespoons). Be careful not to break egg.

4. Watch what happens to egg.

 ★Tips to make kids most successful in this experiment

1. Remove egg from the water cup before you stir salt into water.

2. Make sure not to use broken eggs.

3. Both raw and hard boiled eggs are fine.

http://www.sciencekids.co.nz/experiments/floatingeggs.html

(Similar experiment in same concept but not the same experiment)