This is a Schlieren image, which reveals differences in the density of air above the candles. To find out more about these images, visit Wikipedia: Shadowgraph, and to learn how to make one, visit Schlieren Photography Principles.
- Making one of these images is more complicated than making a shadowgraph, such as the image in From Physics Research. - For more high-speed images by Andrew Davidhazy, visit this page.
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Image credit: Andrew Davidhazy, Rochester Institute of Technology
