The metallic construction of your Eiffel Tower weighs seven,300 tonnes whilst the complete framework, which includes non-metal components, is approximately 10,000 tonnes. As a demonstration in the economy of style, if the seven,300 tonnes of your metallic framework were melted down it would fill the 125 metre square base to a depth of only half a dozen cm (2.36 in), assuming the density with the metal to be seven.eight tonnes per cubic metre. Depending on the ambient temperature, the top of your tower may well shift away from the sun by up to 18 cm (seven.1 in) as a result of thermal expansion of your metallic around the side facing the sun.