Schlieren in NYTimes Science

The Mysterious Cough, Caught on Film – NYTimes.com

The process involves a small, bright light source, precisely placed lenses, a curved mirror, a razor blade that blocks part of the light beam and other tools that make it possible to see and photograph disturbances in the air. In the world of gas dynamics, a cough is merely “a turbulent jet of air with density changes.” Though coughs spread tuberculosis, SARS, influenza and other diseases, surprisingly little is known about them. “We don’t have a good understanding of the air flow,” Dr. Settles said.

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