As a subject matter expert in materials science, I can tell you that the lightest metal in the world is Lithium. It has a density of only 0.534 grams per cubic centimeter (g/cm³), which is about half the density of water. Lithium is a soft, silvery-white metal that belongs to the alkali metal group. It is the least dense of all the solid elements and is highly reactive, especially with water.

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The new metal, called Microlattice, is 100 times lighter than styrofoam and 99.9 percent air. Yes air. It's made of interconnected hollow metal tubes made of nickel about 100 nanometers thick, that's 1,000 times thinner than a human hair. Microlattice is light enough to balance on top of a dandelion.read more >>