What ingrediants make a popping sounds?

Question

Hello,
Dry ice and water make a large bang sound when mixed together and so does Pop Rocks candy mixed with soda. Of course these 2 parts are contained in a bottle.

I'm tryng to make some noise bangs for airsoft wars. I have a two (divider) in a bottle that easly breaks so the two parts can mix together to react. My problem, neither dry ice or carbonation of soda lasts long enough in the field all day.

Is there other types of long lasting materials (non firework) that when mixed together, it'll make a bang?
Any information is greatly appreciated.
Thank you.

Answer 1

You got some extra money?

http://www.hobbystores.com/amatos/bigbang.html

Answer 2

NO,
But maybe you should ask this question under the Science and Math heading. There are categories under that heading where you may find an adequate answer.
I've been around a lot and have no idea how you could accomplish your objective with a simple chemical brew.
The first answer would work, but you are dealing with an explosive device.
If money is no object, compressed gas of any type, contained and then safely released, would do the job. You could use a battery powered air compressor and a device with a hinged cap that could be suddenly, but safely released after building up adequate pressure. It would take a bit of time to adequately build up the pressure between each "shot". The size of the container and the pressure would effect the sound.
It still wouldn't sound like a real explosion. (But neither do "pop-rocks".)