You must know that rotten eggs float in water. But a good egg does not float , it sinks in water. But you know why ? Because sulfide gas. Rotten eggs float due to the presence of sulfide gas inside them. However, a good egg does not contain any gas , so it sinks. I have already said that rotten eggs contain sulfide gas. So when this egg is put in water, sulfide gas applies upward pressure on the egg. As a result, the average density of eggs decreases. Then the average density of the egg. Becomes less than the average concentration of water. Therefore , the amount of water removed by putting rotten eggs in water is more than the mass of eggs. And this is why rotten eggs float in water. On the other hand, the average density of a good egg is higher than the concentration of water. So if you put a good egg in water, the amount of water it removes is less than the mass of the egg. That is why if a good egg is left in water, it sinks.