Aerogel - the world's lightest solid - Graphene X

Aerogels are a class of materials characterized by their extreme lightness and porous structure. Fundamentally, they are derived from gels, where the liquid part of the gel has been replaced with a gas. This results in a solid with extremely low density and thermal conductivity. Their low density (they can be up to 99.8% air) and transparency to certain wavelengths of light have opened up applications in areas like insulating performance gear, and spacecraft.

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THE G•O•A•T  on X: Graphene Aerogel, the world's lightest solid