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Definition of Schlieren photography
1. Noun. Any of several techniques used to record regions of different refractive index in a fluid; especially used to visualize the flow of air around objects ¹
¹ Source: wiktionary.com
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1. Noun. Any of several techniques used to record regions of different refractive index in a fluid; especially used to visualize the flow of air around objects ¹
¹ Source: wiktionary.com