The experiment of floating eggs needs a chopstick, salt, eggs, transparent cups and water. Experimental steps: take out the glass, pour in about 3/4 water, and put the eggs in the water, and the eggs will soon sink to the bottom of the glass; Continue to pour the salt into the water and stir it quickly with chopsticks to make the salt fully dissolve in the water; The eggs slowly floated to the surface from the bottom of the cup.

Principle: Because the density of eggs is less than that of salt water, eggs will float on salt water. When fresh water is added to salt water, the density of salt water will decrease continuously. When the density of salt water is less than that of eggs, eggs will sink. Objects with low density will float on objects with high density. Eggs are denser than water, so they will sink to the bottom of the water. But the density of salt water is higher than that of water, and the density will increase with the increase of salt content in water. So when the salt in the brine reaches a certain level and the density of the brine exceeds the density of the egg, the egg will float.