Template:POTD/2007-05-19

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A 2.38 g piece of aerogel supporting a 2.5 kg brick. Aerogels are stiff foams composed of up to 99.8% air and with a density as low as 1 mg per cubic centimetre.

Aerogels hold 15 different records for material properties, including best insulator and lowest-density solid.Photo credit: NASA