Le 02/12/2009 10:04, Invisible nous fit lire :
>>>> The convenient thing is that when they start to go bad, you know very
>>>> quickly.  Good eggs don't float; bad ones do.
>>> My cookery teacher told me this. Is it actually true?
>>
>> Yes.  Have tried it and it works just fine.
>>
>> Any reason why you'd think it doesn't work? ;-)
> 
> It just seems suspiciously convinient, that's all. ;-)

It's all physic: eggs have an air volume inside, at one end.
As the egg get older, the volume of the real-egg matter diminish a bit,
leaving more room for air. Like a submarine, emptying the ballast
(filling them with air) has a clear result: making float.

The interesting fact about the hen's egg is that a fresh egg's density
is a bit above the water, and old one's is below. It does not work for
ostrich's egg.

On the other hand, it is also easy to separate boiled egg from normal
one (before breaking them): if you rotate them on a plane, boiled egg
keep rotating, normal one  slows down more quickly.

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