The second method, producing hydrogen, is far more effective and quite dangerous.
Dry ice probably would not work on the scale required.
On Jul 23, 2012, at 10:50 AM, firstname.lastname@example.org wrote:
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> : Make balloon float without helium [1 Update]
> : Make balloon float without helium
> Anannop Onkaew <onk...@gmail.com> Jul 23 08:07AM +0700
> Dear Mathew and all member of grassrootsmapping,
> I found the way to use dry ice to float balloon by this link ------>
> would like to ask your opinion,does it work ?
> Thank you
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