Sea water has arround 3.5 % of salt.
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is water conductor or insulator
This had to do with density. When you put the egg into the water, it sinks as it is more dense than the water. However, if you add salt in the water, it becomes salt water and makes the water more dense than the egg so the egg can float. It is the same reason why people float in the dead sea. The dead sea is very salty and is more dense than humans. That's why we float so well in the dead sea.
That indicates that the average density of an egg is greater than the density of pure water but less than that of salt water. Salt water has more density the regular/pure water and the more salt you add the more it floats.
Fresh eggs float in salt water because the density of salt water is more than the density of the egg. But fresh eggs do not float in fresh water because the density of water is less than that of the egg. Salt increases the density of water.
Salt water have a higher density.So it can produce enough upthrust to make the egg float.