This experiment calls for one fresh raw egg, one glass, a tablespoon, salt and freshwater. Fill the glass halfway with salt. Using the spoon, slowly add the water to the glass without mixing it with the salt. Gently place the egg into the water. It will remain wherever it is suspended. If additional salt is added to the glass, the egg will float to the top. If additional water is added to the glass, the egg will sink to the bottom.
This experiment calls for two glasses, two fresh raw eggs, salt and water. Mix approximately 20 teaspoons or 6 and 2/3 tablespoons into the glass of water. Fill the second glass with freshwater. Gently place one egg into each glass. The eggs will float in the saltwater but not in the freshwater.
Gather two fresh raw eggs, two drinking glasses, salt, tap water and a small scale. Fill both glasses halfway up with tap water. Add five heaping tablespoons of salt and mix well. Weigh the eggs to be sure they are the same weight. Crack open one of the eggs and place it carefully onto the surface of the glass of tap water. Crack open the other egg and place it on the surface of the salted water. Weigh the two glasses separately. The egg will sink in the freshwater and float in the saltwater. The saltwater will weigh more than the freshwater.
When an egg has passed its use by date, the egg is going bad. As the contents of the shell decay, gases are emitted, and these gases, which are lighter than water, will cause the eggs to float.