Today's New York Times has an excellent piece online about schlieren photography. Two images by Gary Settles at Penn State caught my eye. The top image shows an AK-47 firing high velocity (supersonic) ammunition; the bottom image shows a revolver firing subsonic ammunition.
Comparing the left sides of the two images, you can clearly see that the revolver bullet has not outpaced the expanding sphere of sound from the weapon firing, whereas the rifle bullet is already outside the sphere.
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