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The Eiffel Tower is mostly made of iron and its average height is about 324 meters. But surprisingly during summer, its height increases by about 17 centimeters.
Do you know why??
It is because of thermal expansion. As iron heats up, the kinetic energy of its particles increases. Hence, they vibrate faster and occupy more space, causing the iron to expand and thus, making the tower taller.
![](https://i.ytimg.com/vi/ANBdrDS-txw/maxresdefault.jpg)