EXPERIMENT
Fill one of the drinking glasses almost to the top with plain tap water.
Gently drop one of the eggs into the water-filled glass. It sinks right to the bottom!
Fill the second drinking glass half-full with water.
Add four tablespoons of table salt to the water, and stir.
Fill the rest of the cup with water, almost to the top.
Gently place the second egg into the salt water solution… it floats!
- See more at: http://www.stevespanglerscience.com/lab/experiments/floating-egg#sthash.dbQRtCp2.dpuf