Aerogel is a porous solid having the lowest bulk density of any known substance. It's made out of a gel in which the liquid component has been replaced with a gas. The result is a solid with an exceptionally low density and a number of unique features, the most notable of which is its ability to act as a thermal insulator. Because of the material's trans light scattering, it's known as frozen smoke, smoke, solid air, or blue smoke, nonetheless, it feels like expanded polystyrene (styrofoam) to the touch.
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