>>
http://www.extremetech.com/extreme/153063-graphene-aerogel-is-seven-times-lighter-than-air-can-balance-on-a-blade-of-grass>
>If it's lighter than air why doesn't if float up into the upper atmosphere ;-}
The surface doesn't appear to be sealed, so I imagine the aerogels are saturated with air.
That would be analogous to wood - most woods are less dense than water and therefore float, but not if they're saturated with water i.e. waterlogged.
Regards. Al
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