Aluminum is a metal that is silver-colored and very light. Aluminum comprises 8.1 percent of the Earth's crust, making it the third most abundant element. This metal is too reactive to be found in its free form in nature, but it is present in various minerals.
Aluminum's physical properties make it attractive in many industries, especially in the airplane industry. Aluminum is used in the body of airplanes because it is so light. It conducts electricity well, so it is often used in gigantic electrical conductors. The mass of aluminum favors the construction of larger conductors because weight is not a limiting factor.
Because of aluminum's reflective nature, it has been used in jewelry and mirrors. Aluminum can be rolled into sheets and is cheaper and more recyclable than many other metals. It has replaced tinfoil in protecting food.