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Schlieren optics - GIF
Schlieren optics is an optical technique which allows the user to image the flow of fluids with varying densities.
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Previously:
https://www.homemadetools.net/forum/...702#post151948
https://www.homemadetools.net/forum/...921#post148752
https://www.homemadetools.net/forum/...808#post148306