Actually it would be a "column of air" techinically. The AirKooza, as it seems, utilizes the fact that air actually responds to the physics of fluid dynamics. Air is a fluid believe it or not, so just like you can send a small amount of fluid very far very fast by pushing it through a small hole you can do the same with air. Essentially you are accelerating a column of air inside the AirKooza and as it tapers down the barrell it accelerates th e air forcing all of the air in front of it ahead through a smaller area (kind of like a hose nozzle). By a certain distance it will dissipate but because of its "seemingly" large volume it would appear to take some time for the initial force to drop to the point to which you wouldn't be able to feel it anymore.

Never actually used one, read anything about it or seen it in person. Just my thoughts...
Welcome to the world of physics guys.

 

The noise that you hear is lost energy. Everything that moves or does work loses some amount of energy to frictional forces which result in heat or sound. In the case of the AirKooza the friction between the moving air and the plastic inner tube causes noise instead of heat from lost energy. A measurable amount of heat energy would require either a very large object or a high rate of speed... like the space shuttle renetering (air, as a fluid with extremely low density, has a small friction coefficent).

Go freshman in college... Us college boys is SMRT!

 

edit: punctuation.. ignore. Its summer yo.