From Nice News
"When the Eiffel Tower was first built in 1889, it was the tallest building in the world at 312 meters tall, or a little more than 1,023 feet. Today, it’s around 60 feet taller because of the radio and TV antennas at its peak, and while nothing’s going to make it the tallest building in the world again, its exact height varies by a few inches depending on the time of year. That’s thanks to a scientific phenomenon called thermal expansion. In general, when a substance heats up, its atoms become more active and move farther apart, making its volume larger. Some substances are more sensitive to thermal expansion than others, including metals like iron. Because the Eiffel Tower is made up of almost pure iron — and there’s a lot of it — hot weather leads to some different measurements. In the summer, the tower not only grows (by as much as 6 inches), but also gets a little lopsided; because the sun only hits one side, it tilts ever-so-slightly away from the sun."
