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Bismuth is a dense metal with about 86% of the density of lead

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Aerogel Disc Touch Display Subscriptions Bismuth is a dense metalAerogel is one of the most remarkable materials ever developed. Often referred to as frozen smoke for its faint blue, cloud like appearance, this ultra light solid is composed almost entirely of air. Despite its delicate look, it is a rigid, solid structure with extraordinary physical properties. Formed by replacing the liquid within a gel with gas, aerogel develops an open, highly porous network. This unique structure gives it some of the lowest