[grassrootsmapping] : Make balloon float without helium

[Anannop Onkaew]

Dear Mathew and all member of grassrootsmapping,

    I found the way to use dry ice to float balloon by this link  ------>  Make-a-Balloon-Float-without-helium/, 

would like to ask your opinion,does it work ?

Thank you

Jo

  

[jessibreen]

Hi Jo,

The dry ice method, where they float a breath-filled balloon in a larger balloon full of carbon dioxide gas (the white cloud that billows off of dry ice when you add warm water), wouldn't work to inflate a mapping balloon. That experiment creates a mini-atmosphere of CO2 in the larger balloon which, because it's heavier than the gas we expel when we breathe, make the little balloon float.  That's not a condition you could recreate on a landscape scale.

Cheers,
Jessi

[andrzej zaborowski]

On 23 July 2012 17:35, jessibreen <jessi...@gmail.com> wrote:
> That's not a condition you could recreate on a landscape scale.

And if you could, you might want to avoid it anyway since it would
likely lead to quick extinction of most species :)

The second method in that video, using hydrogen, is probably more
viable. I've tried it before and I've seen someone on the Public
Laboratory posted a note about it too. It's a little slow if you want
to fill a bigger balloon though. If you speed it up by adding more
aluminum, the temperatures get higher and more dangerous. The
lye+aluminum method is also not that much cheaper than helium, only
some 2-3 times cheaper where I live (per cubic meter). But there may
be ways to improve the speed and the price.

Cheers

[Anannop Onkaew]

 Suppose we use many small balloons as the image below, is it possible with dry ice ?

Thank you.

 

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[jessibreen]

Multiple CO2 balloons still wouldn't work. They're even heavier than balloons inflated by mouth.

On the hydrogen topic...a friend who is an inorganic chemist, suggested that zinc would be a better option than copper. Scaling is still an issue as well as time and safety.

Cheers,
Jessi