# How powerful are air cannons?

I wondered how powerful air blasters are.

Is it possible for one to be so powerful that the shock wave passes through walls, floors and ceilings? Could it make bumps on metallic surfaces or at least an audible noise, like a pebble falling on it?

The reason I ask, is that I'm trying to debunk a claim that someone is being assaulted by a neighbor through some kind of sound waves or pressure waves. I'm highly skeptical, but I'm trying to figure out a possible mechanism in the eventuality the person is right, and the only reasonable thing I could come up with is a pressure cannon.

• If it’s used for de-clogging it obviously has more force than a falling pebble. So, yes, it could make a noise on a metal surface, it can potentially dent it (if concentrated enough) and so on. – Konrad Rudolph Jul 15 '11 at 10:55
• @MathMike perhaps you meant fluid, and not liquid? – Beofett Jul 15 '11 at 17:21
• yes. fluid. I'm going to the penalty box now to feel shame for the next 2 minutes. – MathMike Jul 15 '11 at 18:53
• Air is matter. It has mass, momentum, kinetic, potential, and heat energy. When I fly, its momentum holds my plane up. Ever see those videos of nuclear bomb blasts? The damage is done by air transmitting the energy (and by the light). – Mike Dunlavey Jul 16 '11 at 22:38
• Define "being assaulted". A comment to an answer below seems to presume assulted = knocked over, as in literally being made to fall to the floor from a standing position. If assulted here means something more subtle then it's possible that it's infrasound. – slebetman May 20 '14 at 14:31