If you place a chicken egg into a pot with watetr, you can estimate the age of the egg by the angle of its longitudinal axle to the bottom of the pot. That is to say, a fresh egg lies horizontally in the water, a 30-day-old egg stands on its point. How can the difference be explained?
The older an egg is, the larger its air chamber becomes. The air chamber is located in the thick end, so this becomes lighter with age. This happens because a constant exchange of air takes place through the eggshell and water slowly evaporates from inside. Oxygen is needed, as the chicken embryo develops, so the eggshell has tiny pores. When the egg lies in hot water and is heated up, the expanding air inside emerges from the holes, forming small bubbles.
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