Some dumb kids were caught making "Drano bombs" yesterday and are now facing felony charges. What I've never been able to figure out, is why these these are called a bomb?
The science is simple, the reaction create hydrogen gas, the gas expands and it make the bottle burst open with a loud bang. Then boys smile because they made a loud noise, yippie. But the bottle bursts with sub-explosive force. I don't remember the exact number, but at one time the ATF published a feet-per-second speed of a chemical reaction to legally call it "explosive". I think it was something over 9000fps, faster than a bullet and it was definitely over 3000fps, a fast-speed even for a bullet. One of these kiddie-bombs must rupture with a psi under 100, which assuming a 2L bottle of air, calculates to something around 300fps - on par with a BB gun by speed, but more foot-pounds by volume making it more damaging. Enough to break a few fingers. There are very simple mechanical ways of creating much larger 'explosions' measured by speed and energy output. I don't think putting a tank of non-flammable compressed air in your oven is called "a bomb", but it would deliver more energy than these do when it ruptures.
They are not Destructive Devices (ie military grenades). They are not legally "explosives" as there is no explosion. The chemical reaction of 2Al + 3H2SO4 ---> 3H2 + Al2(SO4)3 is not on the explosives listing at the ATF, so they are also not prohibited by Federal regulation (as far as I can tell).
I'm not disputing that making them is stupid, dangerous and potentially illegal. They also clearly fall under criminal mischief laws, which is a misdemeanor. But these things seem to be universally treated as a felony charge. So what is the legal rationale to calling these things bombs and charging kids with a felony for making them?

