Did You Know the Eiffel Tower Grows 15 cm Every Summer?

追加: 2026-05-17

[00:00:00]Did you know the Eiffel Tower grows 15 cm every summer? Atoms in a solid are held in position by electromagnetic bonds, forces that act like springs. Add heat and you add energy. The atoms start vibrating, oscillating back and forth around that balanced position. So when atoms vibrate with more energy, they drift slightly further apart on average.

[00:00:16]The object gets bigger. On 1 m of iron rod across a 40° temperature change, the expansion is less than half a millimeter, barely measurable. Now make that 1 m 330 m. The Eiffel Tower is made of rot iron, 330 m tall. Paris winters reach near zero. Paris summers reach 40°. Every summer it grows 15 cm. Every winter it shrinks back. Gustav knew this in 1889. Every joint and connection in the tower was designed to expand and contract without structural damage. And it still works perfectly today.

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