Normal egg vs rotten egg, sinks or floats! Is it just because of density ? or something else? 🤔🤔🤔

 Do you ever think that an egg is not floating in the water but a rotten egg is floating!!

How impressive!

It's all about density. 

When the density is high, then it sinks

but when the density is running low, it floats.

Well, let's take a clear concept about this.  

When we enter an egg into the water,

it sinks. Because the density of the water molecule is smaller than the density of an egg.

But, 

when the egg has begun to rotten. 

It produces Hydrogen Sulfide(H2S) gas.

Melting Point: -82*C 

Molar Mass: 34.08 gm/mol-1

The mean density of the rotten egg is smaller than the density of the water molecule, because of producing H2S gas. 

Then H2S gas will create an upright pressure which is called one type of buoyancy. Thus the density of a rotten egg has become smaller than the water molecule and it floats.

But,

if you mix some salt (NaCl) into the water, then the density of the water molecule will become raise. After that, a normal egg can be floated in that water because the density of the water is higher than the normal egg by mixing some salt.

Nadeem Abdullah 
dept of Chemistry 
University Of Rajshahi