# The Naked Scientists Forum

### Author Topic: floating eggs  (Read 8713 times)

#### baby2michaelt

• First timers
• Posts: 7
##### floating eggs
« on: 04/03/2004 14:07:47 »
me and my fiance are doing a science fair project on floating eggs and we were wondering what causes salt to make eggs float. And is there a site that explains this reaction

baby2michaelt[}:)]
« Last Edit: 04/03/2004 14:09:18 by baby2michaelt »

#### pipster

• First timers
• Posts: 4
##### Re: floating eggs
« Reply #1 on: 04/03/2004 14:45:58 »
I think that if you put salt in water its density changes. So if you have a very salty solution, it has a higher density than water.

If the solution is high density, the upthrust required to equal the volume of water displaced is less and so the egg floats higher.
I.e. eggs "float" or sink less, when the solution is denser, and the solution effectively "sinks" to the bottom of the beaker, preferentially.

How dissolving the salt changes the density is another question though!

Pipster [:I]

#### baby2michaelt

• First timers
• Posts: 7
##### Re: floating eggs
« Reply #2 on: 04/03/2004 17:32:53 »
i guess tht that is the reason that it takes ten teaspoons of water to make an egg float
thanx

baby2michaelt[}:)]

#### CsManiacDan

• Jr. Member
• Posts: 28
##### Re: floating eggs
« Reply #3 on: 21/03/2004 17:53:09 »
Hello Everyone!

The water changes density because salt molecules are hevier than Water molecules. Observe:

Relative Mass H20 (Water) = 18

Relative Mass NaCl (Common Salt) = 58.5

If salt was less Dense than water would the density of the solution decrease? Don't Know.

I Love Caesium!!!

#### The Naked Scientists Forum

##### Re: floating eggs
« Reply #3 on: 21/03/2004 17:53:09 »