What is thermal expansion?

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Thermal expansion is the physical change of size of something owing to higher thermal energy of the object. Heat (thermal energy) causes increased atomic motion in materials, and this change in the kinetic energy of the atoms and molecules of a material will cause it to increase in volume.
It is a physical characteristic of matter (as opposed to a chemical one), and it is pretty much true across the board. No, ice does not expand when it turns to water, and there are a couple of other exceptions, but, in general, when we heat things, they increase in volume. So the density will decrease but mass remains the same. As in the density formulae, Density= Mass over Volume. When mass do not change and volume increases, it is obvious that it had density to be lower.
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