yes
An egg will sink in water but will float in salt water. An egg will sink faster in hot water than it will in cold water.
If the egg is good and not spoiled it will sink down. If the egg is spoiled it will float up.
An egg will float in salt water because the salt makes it denser and allows the egg to stay near the surface. But in regular water it will sink straight to the bottom.
Salt water is denser than pure water.
Salt water is denser than fresh.
How much salt water is present is not important, the problem is what is the concentration of salt in the water. The saltier it is, the denser the salt water becomes. If the salt water is denser in comparison to the density of the egg (which will more or less vary with each egg), then the egg will float; if not, then the egg will sink.
Salt water. Salt water is very hypotonic and will force the egg to float. Regular water is hypertonic and force water in. Causing the egg to sink like the Titanic.
An egg floats in a salt solution because the density of the salt solution is higher than that of the egg, causing the egg to float. In fresh water, the density is lower than the egg, causing it to sink.
The density of liquids really depends on the suspended matter in it. If you have really dense concentration of salt in water, yes it could be denser than an egg. If you have merely a weak solution of salt, then the egg is denser... it depend on how much salt you have in the water.
Assuming that we're talking about the egg being in water, salt just makes the water more dense. As long as the water is more dense than the egg, the egg will float. The way to reverse this is by changing the density of either the egg or the water so that the egg is more dense than the water, causing it to sink. It's more practical to reduce the density of the water, by adding even more water. The salt concentration decreases, making the water eventually less dense than the egg again.
If you add salt to water, it becomes a solution of salt and water. That solution is denser than just water. Archimedes' Principle says that if you place an object in a fluid, it will be "buoyed" up by the weight of the fluid that it displaces. If you're an egg, then you will displace an egg volume of the fluid into which I place you. The displaced volume of salt water weighs more than just water, so you float rather than sink.
The density of the average egg will be slightly greater than water, so it will sink. To make the egg float, make the water more dense by adding salt. For one cup of water, adding three tablespoons of salt should be about enough to make the egg float.