Remember that mass equals volume multiplied by density.
When anything is placed in water, it floats when it displaces a volume of water equal in mass to its own mass before it is submerged. It doesn't float if the volume it displaces has a mass less than its own mass.
When you add salt to water it dissolves and the combination of salt and water has a higher density than water. That is because the molecues of salt (sodium and cloride) are larger than the molecules of water (hydrogen anf oxygen).
When you put an egg in salted water, it displaces the same volume as it does in un-salted water but because the salted water has a higher density, the mass dispalced by the egg is higher than the egg before the egg is submerged and the egg can float. This only works if you add enough salt to that the incease in density is sufficient.
It is interesting to note that a boat will float higher in the ocean than in a fresh water lake.
To understand this we need to understand density, which basically refers to the amount of matter, packed in an object, the egg and water both have densities and this determines whether the object will float or sink. The egg sinks in plain water because in this case the density of the egg is greater than that of the water. When we add salt, the amount of matter packed in the same amount of water increase and hence it becomes dense. If you keep on adding salt a point will come that the density of water exceeds that of the egg and the egg will become relatively lighter and start to float.
There is another way of understanding this, according to a principle developed by Archimedes, an object placed in water will float when the force exerted by the liquid is greater than the liquid displaced by the object which is called buoyancy. When we add salt to the water it exerts more force of the egg than the water it has displaced and it starts to float.
Instead of egg we can use a lemon also. In pure water the lemon will sink to bottom of the tumbler. When salt is added it starts rising up and in dense salt water it floats. The phenomenon is explained as follows Force of gravity pulls down to earth all bodies. But when put in water, in addition to force of gravity force of bouyancy will also act on the bodies. Gravity pulls in downward direction whereas bouyancy pushes it in upward direction. If the two forces are balanced then the body starts floating. If gravity is more than bouyancy the body will sink to the floor of the vessel if bouyant force is equal to that of gravity then the body rises up and the body will be in submerged state. If the bouyant force is more than gravity the body will float on surface When salt is added to water its density is increased and therefore the bouyant force is also increased Bouyant force is equal to the weight of liquid displaced. Since weight of salt water is more than fresh water more boyant force salt water exerts on the body
OK, sorry to say this but, the people who had answered your question were completely dumb in the head! Know, the water has a dense and so does the egg, so lets say we have plain water and we put the egg in it sinks that is because the egg is heavier than waters dense. Density is like weight basically. Know, lets say the water has salt, the egg floats. That is because this time water has a more powerful dense than the eggs!
Since in normal circumstances the denisty of water is less than that of egg when we add sugar or salt to the water the denisty of water increases as much sugar or salt as we add at a point the salt water denisty become more than that of egg so the egg floats in salt water
Well, I am a young scientist of density and buoyancy. And if you have heard density is basically like weight and buoyancy means float or rise. Now, the salt makes water have more density then the density,. See the water without salt makes the egg sinks because of its heavy weight/dense and so yeah. But with salt the egg gets more power than the egg, and it floats!
according to Archimedes’ law F=ρgv,we can conclude that ,if the flotage is stronger than gravity ,the egg will float. Then it depends on the density of the egg and the liquid. Because the density of sea water is greater than the egg, the egg floats.is this answer satisfied you ?
