Q:

How can you test if an egg is fresh or hard-boiled?

A:

Quick Answer

Those who can't tell whether an egg is hard boiled or raw can tell the difference by placing the egg on a flat surface and spinning it by hand; a cooked egg will spin smoothly, while a raw egg will wobble. The difference in spin quality between a raw and hard-boiled egg is due to the yolk. In a cooked egg, the yolk will be solidly encased within the cooked white and will not be able to move when spun, leading to a smooth spin, while a raw egg's yolk will be able to move freely, which will cause the egg's center of gravity to shift as the yolk moves within the egg.

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How can you test if an egg is fresh or hard-boiled?
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Full Answer

When the raw egg's yolk moves inside the egg and throws off the center of gravity, it will lead to a wobblier spin. This same principle can be observed when the person testing whether the egg is cooked reaches out and gently stops the egg from spinning by lightly touching it. A cooked egg will stop smoothly and, if it isn't knocked off kilter by the hand, will not wobble much when stopped. By contrast, the raw egg will wobble quite a bit as the loose yolk continues to move inside.

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