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Next stop - vacuum balloons
#5
You only have to seal the outside surface. if that could be made air-tight, the interior would remain at the same density, even after the air inside had cooled.

A cold hot air balloon, or a partial vacuum balloon, would be the result, assuming the foam could resist compression.
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Messages In This Thread
Next stop - vacuum balloons - by ai_vin - 03-27-2013, 05:39 PM
RE: Next stop - vacuum balloons - by stevebowers. - 03-28-2013, 07:11 PM
RE: Next stop - vacuum balloons - by ai_vin - 03-29-2013, 07:07 AM
RE: Next stop - vacuum balloons - by Drashner1 - 03-29-2013, 12:37 PM
RE: Next stop - vacuum balloons - by stevebowers. - 04-14-2013, 05:55 AM

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