When the egg is spoiled, the decomposition becomes. So the molecules in it turn into gas.

As everyone thinks, should there be gas in it, the spoiled eggs are floating? But it doesn't. The gas is discharged through the microscopic holes in the eggshells. This will reduce the density of the egg. So it starts floating. Good eggs submerge in water.

Some eggs will be spoiled even if there is an expiration date. The reason for that is too much heat.

Well, you are going to a super market. Will you take a tumbler with water in it to test good eggs?You can't right? There is a way to check good eggs. Keep the egg in your ear and gently shake it. If you hear too much water, it means that egg is spoiled.