a boiled egg
No. The egg is animal products.
An egg sinks if it is more dense than water.
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Yes. hard-boiled egg
Then same size as the raw egg that was boiled.
No it does not have to be raw or boiled fo rthe egg to float!
Yes, it is generally good if an egg sinks when placed in water, as this indicates that the egg is fresh.
Boiled egg
A boiled egg will float in salt water.
No. When an egg is boiled anything living in or on it is killed.
You get a hard boiled egg, and put a hole in it.
A previously boiled egg (unshelled) would simply be heated up and become a very hard boiled egg.