"Surprising Supersonic Properties of Canned Air"

Canned air from duster tubes is found to be supersonic, as evidenced by the presence of shock diamonds in the gas flow, typically seen in afterburning jet turbine or rocket engine exhaust streams. This phenomenon was captured using a Schlieren imaging setup, which visualizes changes in a fluid's refractive index, making imperceptible changes visible. The setup, while requiring care, is not overly complex and can be replicated using accessible materials.