why does an egg float
Old eggs float in fresh cold water because of a large air cell that forms as the egg cools after being laid. As the egg ages, air enters the egg and the air cell becomes larger and this acts as a buoyancy aid.Learn All About Eggs and How To Cook Them.f the egg is at an angle on the bottom-it is still fresh and good to eat. If the egg stands on its pointed end at the bottom-it is still safe to eat but best used for baking and making hard-cooked eggs. If the egg float-they're stale and best discarded. If the egg stay at the bottom-it is fresh.