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Replacing liquid in a gel with gas creates ultra-light solids up to 99 percent air. The figure is taken from NASA Science, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

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Mondo Knows Facts

Aerogel is a solid synthetic material that is mostly air

Replacing liquid in a gel with gas creates ultra-light solids up to 99 percent air

Aerogel is manufactured by extracting the liquid component of a gel through supercritical drying, leaving behind a rigid nanostructured silica mesh. The resulting solid consists of up to 99 percent air by volume, making it extremely light and translucent. Its intricate nanoporous structure traps air molecules, making aerogel one of the best thermal insulators known.

Where this comes from

NASA Science

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Tags: chemistry, aerogel, materials

Aerogel is a solid synthetic material that is mostly air: the short answers

Where does this come from, and can I check it?: Replacing liquid in a gel with gas creates ultra-light solids up to 99 percent air. The figure is taken from NASA Science, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a science fact?: Yes. It sits on the Science shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.