• As an object gets hotter, its particles vibrate more, and so its particles are further apart from each other.

  • This causes the object to expand, i.e. it takes up a larger volume. This process (expansion by heating) is known as thermal expansion.

  • Thermal expansion explains how thermometers work! As the liquid in this thermometer gets hotter, it expands — going up the glass tube. The height of the liquid up the tube tells us its temperature!

  • Thermal expansion is an example of a physical change.



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