Aerogel is a low-density solid-state material derived from gel in which the liquid component of the gel has been replaced with gas. The result is an extremely low density solid with several remarkable properties, most notably its effectiveness as an thermal insulator. It is also very strong structurally, able to hold over 2000 times its own weight. Its impressive load bearing abilities are due to the dendritic microstructure. In the image, a 2.5kg brick is supported by a piece of aerogel weighing only 2.38 grams.
via shychemist
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