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Lew Hodgett

wrote:

IIRC, plastic soda-pop bottles are rated for about 150 psig.
So you could take a small one, put some vinegar in it and
then drop in some baking soda wrapped in wax paper,
screw on the cap and put it somewhere safe to see how
big a bang it makes.

When I was a kid, would use a glass Mason jar, put in a rock for
weight, some carbide and water, then screw on lid and toss in the creek.

The carbide and water combined to produce acetylene gas which would
expand and cause the glass jar to burst while under water.

Any fish would float to the surface for easy pickings.

Lew