Dear Agnes,
I know it's not really an explosion but have you tried diet coke and
mentos? It's good fun-but do it outside!!!
Melissa
http://www.youtube.com/watch?v=znoSaHwbHYg
2009/7/3 Selina Hawkins <[log in to unmask]>:
> Dear Agnes
> You need to contain the reagents so that the gases that are produced are
> also contained and then the pressure builds up and you get the desired
> explosion. You need a vessel that seals well enough to prevent gas
> escaping, but that fails in a safe way e.g. by the seal breaking rather than
> the whole thing shattering. The plastic canisters that photographic film
> come in are ideal for this, although they are a bit harder to get hold of
> now everyone uses digital, but you can ask in your local photography shop.
> You need cylindrical ones, not the oval ones. If you put vinegar and
> baking powder (or lemon juice and bicarbonate of soda) into a film canister,
> give it a shake and stand back it produce quite a nice bang. All that
> happens is the lid pops off, so then you can repeat with the same equipment.
> The only risks are if you stand too close you could get vinegar/lemon juice
> in the eye or be hit by a flying plastic film canister, or lid. You can do
> it in a big plastic box (e.g. storage box) to contain the mess a bit and you
> may also get more impressive noise that way as the canister ricochets off
> the box walls.
> Hope that helps
> Selina
>
> On 3 Jul 2009, at 14:25, Agnes Becker wrote:
>
> Hello,
>
> Does anyone know any safe but impressive explosions a child can make with
> household products? So far I have tried the following:
>
> vinegar and baking powder
> toilet cleaner and aluminium 'bomb'
> hydrogen peroxide and yeast 'elephant toothpaste'
>
> None have worked incredibly well. They just foam a little out of the
> measuring cylinder. The toilet cleaner and aluminium barely worked at all.
> Even after a whole night of the aluminium balls sitting in the toilet
> cleaner, it didn't go off!
>
>
>
> Please help!
>
>
>
> Thanks
>
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