susan g added about 1 year ago

There are some answers online, and this looked like the right one -- http://answers.yahoo.com...
Another possibility -- if a hard-boiled egg is in very salty water, it may float, but then I would think they all would, not just one -- and it would have to be very salty.

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hardlikearmour is a trusted home cook.

added about 1 year ago

I'd definitely say it's an older egg with a bigger air pocket inside. Might not be rotten, but why take the chance?

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Older eggs will float but that doesn't mean they're bad. If I know I have to make deviled eggs for a party I'll set aside the amount I need 3 or 4 weeks ahead of time b/c they're easier to peel. Also I like to tap the eggs on a table to slightly crack them (this lets water in the eggs making them easy to peel.) Set all the eggs in a pot of salted cold water and bring to a boil. As soon as it boils turn off the heat and cover w/a lid. Let them set 15 minutes then drain and run cold water over them till they're cool enough to peel. Perfect eggs every time. Do the same for egg salad.

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