# When cracking the egg open why is the yolk........

Discussion in 'Chicken Behaviors and Egglaying' started by ScoobyRoo, Feb 23, 2009.

1. ### ScoobyRooSongster

Aug 21, 2008
Land of OZ
always on top? My 9yr. old son asked me to get on my "BYC thingy on the computer and ask why is the yolk always on top after you crack it open into a pan?" In my mind, I kind of know but I don't know how to explain it. Can someone help me out on this one? I apologize if I'm posting in the wrong place. Just wan't sure where to post this question.

2. ### cms1113Songster

Feb 2, 2009
DE
i would assume the yolk is always on top because it is less dense then the white, which makes it float.

3. ### ScoobyRooSongster

Aug 21, 2008
Land of OZ
Quote:Dense is the word I had in mind but couldn't explain that. 'Floating' will help. Thanks

4. ### dancingbearSongster

2,836
29
191
Aug 2, 2008
South Central KY
It isn't exactly on top. It isn't floating. It's just contained in a membrane so that it doesn't flatten out as far as the white, which is not contained inside a membrane. If you break the yolk, it flattens out, and becomes the same height as the white.

Science experiment for kids (and curious adults): Separate the yolk from the white, place the yolk by itself on a flat surface, and observe how tall it stands. Break open another egg, empty it onto a flat surface, and see how tall the yolk stands. Both eggs should be the same age, kept in the same conditions, and as similar to each other as you can manage, size, shell density, etc.

Try breaking an egg into a clear glass saucer, so you can look at it from underneath.

Another interesting thing to do, is candle fresh eggs, to see as much as you can about the shell structure, and see if you can detect the yolk through the shell. You can see a spiral pattern to the shells, sometimes. This is because he egg is turning as it passes through the oviduct, and as the layers of shell are deposited. Sometimes you'll see a spiral around the egg where there's a line of thinner shell.

These ordinary eggs that we see everyday, are really amazing little packages. So are kids, good for you, helping your young one learn cool things!

5. ### ScoobyRooSongster

Aug 21, 2008
Land of OZ
Quote:Great idea, thank you db. We will do that tinight.