Petrography. streaks or irregularly shaped masses in an igneous rock that differ in texture or composition from the main mass.
Physics. the visible streaks in a turbulent, transparent fluid, each streak being a region that has a density and index of refraction differing from that of the greater part of the fluid.
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This included the schlieren mirror and measurements taken in a dedicated aerosol testing room with a ventilation system that allows engineers to isolate the aerosols that emerged from the various instruments.