The Eiffel Tower can be 15cm taller during summer

Explanation:

Simply saying, when a substance is heated, the kinetic energy of the molecules of the substance increases. Its molecule and atoms start to move more. Now the substance occupy more space than before. When the same substance is cooled down, the kinetic energy decreases. So the atoms and molecules take up less space. Whether the molecules expand or contract, their molecules stay the same size. It should be noted that it is only the space between them, that changes on heating or cooling. Some metals expand more than others due to differences in the forces between the atoms and molecules. That is why Eiffel Tower can be 15cm taller during summer.

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