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schlieren optics...
These specialty cameras are designed to pick up the refraction changes in light. When different gases (like helium or sulfur hexfluoride) are introduced at different temperatures, the way light passes through them changes, and the specialized camera picks up the signature. This is called Schlieren Optics.
#fluiddynamics #schlierenoptics #gasses #animatedgif #flame #blowdryer #liquid
