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Download the music in this video:
Song #1: Over Rain
Song #2: Abyss - iTunes:
This is a demonstration of the Schlieren effect. This setup allows you to see changes in air density. The point light source is aimed at the concave mirror. The concave mirror reflects to a focal point. There you use a sharp edged object to partially block the light which helps create a shadow effect that allows you to see air movement.
Big Thank you to:
Ko van der Lubbe
and everyone else that helped with this project.
Other Schlieren videos to check out: