Science Fact ## The Eiffel Tower can be 15 cm taller during the summer
At the point when a substance is warmed up, its particles move more and it takes up a bigger volume – this is known as warm development. On the other hand, a drop in temperature makes it contract once more. The mercury level inside a thermometer, for instance, rises and falls as the mercury’s volume changes with the surrounding temperature. This impact is most sensational in gases yet happens in fluids and solids, for example, press as well. Therefore huge structures, for example, spans are worked with extension joints which enable them some breathing space to extend and contract without creating any harm.