This is called Schlieren photography, a technique that makes air pressure changes visible to the human eye. To capture this, physicists use an incredibly precise optical system. They aim a point source of light at a large parabolic mirror, perfectly aligning the beam with the edge of a razor blade before it hits the camera lens. Normally, the air is too thin to block any light. But when a supersonic bullet travels faster than the speed of sound, it builds up massive pressure in front of it. This
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This is called Schlieren photography, a technique that makes air pressure changes visible to the human eye. To capture this, physicists use an incredibly precise optical system. They aim a point source of light at a large parabolic mirror, perfectly aligning the beam with the edge of a razor blade before it hits the camera lens. Normally, the air is too thin to block any light. But when a supersonic bullet travels faster than the speed of sound, it builds up massive pressure in front of it. This
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