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Old 02 June 2015, 09:05   #11
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,618
Originally Posted by Nos4r2 View Post
It'd be interesting to see how long an inflatable filled with helium would stay inflated.
Not very. Small molecule will pass through membranes much easier than N2 or O2 will. Maybe if you ditched hypalon for Mylar...


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