From China the lightest solid material in the world

A solid, but seven times lighter than air. One of the photos in the links below shows a cube sitting on a flower, with none of the petals tilting. It's a graphene airgel created by researchers at a nanomaterials-macromolecule laboratory at Zhejiang University in China, and that cube was sold at an auction celebrating scientific achievements for $1,6 million in Hangzhou city. capital of Zhejiang province in eastern China. It is the lightest solid in the world: at 0,16 milligrams per cubic centimeter, it beat the record of another aerogel, created in Germany, which weighed 0,18 milligrams. Gao Chao, a professor in the university's macromolecular engineering department, pointed out that the airgel can absorb 900 times its own weight in oil.