A light metal is any metal of relative lower density like Magnesium, aluminium and titanium are light metals of significant commercial importance. The lightest metal that is a pure element is lithium, which has a density of 0.534 g/cm3. This makes lithium nearly half as dense as water, so if lithium was not so reactive, a chunk of the metal would float on water. Two other metallic elements are less dense than water. They have been a global player since 2007 with successfully serving various sections of the industries across the world. Light metals are used mainly in the manufacture of light alloys. The most important light metals are aluminum, magnesium, titanium, beryllium, and lithium. Another important development of the late nineteenth century was the separation from their ores, on a substantial scale, of aluminum and magnesium. Light metal and alloys possess high strength-to-weight ratios and low density, and are generally defined by low toxicity as opposed to heavy metals, except for beryllium. Lighter vehicles that are designed for consumers, as well as the industry and military sectors, consume less fuel and provide a better performance. In addition to carrying larger loads, lighter vehicles can travel the same distances at reduced cost and release less carbon dioxide.