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Why Does Salt Make An Egg Float In Water?

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Anonymous answered
We are talking about displacement.
 
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.
 
I hope this helps.
d ds Profile
d ds answered
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.
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Anonymous answered
An egg floats in salt water because the salt makes the water density stronger. Witch causes the egg to float in the salt water.
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Anonymous answered
Adding salt to water increases it density, making it dense enough to make an egg float in water.
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Anonymous answered
Because the density makes the egg go up to the water.(the density of the salt)
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Anonymous answered
The salt dissolved in the water increases it's density.

To the point that the egg's buoyancy is greater than the gravity effecting it while underwater.
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Anonymous answered
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
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Anonymous answered
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!
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Anonymous answered
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
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Anonymous answered
It can't I tested it out. It is not possible do not waste your time with this project.
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Anonymous answered
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!
thanked the writer.
Anonymous
Anonymous commented
So the egg has less density than the salt water? So if that is true than the egg floats only if its density is less than the salt water. Correct?
Anonymous
Anonymous commented
That does not help me
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Anonymous answered
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 ?
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Anonymous answered
Thanks people that helped me a little I have my project due tomorrow and I waited til the last minute
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Anonymous answered
This is great to look up, it's basically logic, but common sense is not too common nowadays.
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Anonymous answered
Ok I'm doing this project from my class and I have to know what in the egg makes it float or what in the water makes the egg float!?!

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