In Science

How much does aerogel cost?

Silica aerogel of ·1 g/cm3 starts at $8/g or 80¢/cm3. If you'd like densities toward the record of 1 mg/cm3, multiply by--I don't know--500? Carbon aerogels are somewhat cheaper, resorcinol formaldehyde cheaper still. You could make your own and maybe do better.

It seems a 3mg/cm3 aerogel costs $2100/g or $6·2/cm3.
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Can aerogel float on radon?

Yes. Aerogel is less dense than radon. I think it's also less dense than xenon. For a while I wondered about it too, but yes, a solid can float on a gas.
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