Re: Exploding soda bottles

[brian whatcott <inet@INTELLISYS.NET>]

At 10:22 6/10/00 -0400, you wrote:
> Hello all,
>
> Last year a colleague of mine brought some dry ice into the lab for simple
> lab measuring the effects of solutes on lowering the freezing point of a
> liquid. ....
> A. Njaa
> Physics / Chem teacher

Another interesting demonstration possibly - though far less spectacular:
compact some silica sand moistened with waterglass into an interesting shape
(a lawn bunny, perhaps?) and infuse a litte CO2 gas into the sand.

It becomes a rock hard object - made of sandstone in effect.
The process is used industrially for 'cores' to exclude molten metal from
passageways in castings.
It is advantageous to weaken the silicate bond in order to get rid of the
 sand from cast-in passageways - so sugar (or mollasses) is added
to the waterglass to provide a caramelized water soluble bond.


brian whatcott <inet@intellisys.net>
Altus OK