The Eiffel Tower, one of the most iconic landmarks in the world, has a fascinating physical property it grows taller in the summer. Due to the thermal expansion of the iron structure when exposed to heat, the tower can grow by up to 15 cm (6 inches) during warmer months. The iron expands as it absorbs the heat from the sun, and the structure slightly increases in height. This seasonal growth is a natural result of the physical properties of metals and demonstrates how even the most massive and seemingly permanent structures can be affected by changes in temperature.

The Phenomenon of Thermal Expansion

Thermal expansion occurs when materials, such as iron, expand as they heat up and contract as they cool down. While the growth of the Eiffel Tower may be imperceptible to most people, it is a striking example of how large structures can change with the seasons. The phenomenon is not just limited to the Eiffel Tower; many buildings and bridges experience similar changes due to varying temperatures. Engineers account for this thermal expansion when designing structures to ensure their stability. This natural process reflects the dynamic relationship between architecture and the environment. Shutdown123