This is a technique called schlieren photography.    From Wordnik.com.  [pink elephants] Reference

I have some old schlieren photos in my office showing you how terrible.    From Wordnik.com.  [Space]

This parameter allows the sample liquid to settle and to remove streaks/schlieren, especially with long-path cells.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference

Researchers measured the wake of the rotor using a technique known as retro-reflective background oriented schlieren.    From Wordnik.com.  [PhysOrg.com - latest science and technology news stories] Reference

Photo courtesy of Dr. Gary Settles Dr. Gary Settles, director of Pennsylvania State University's gas dynamics laboratory, used the schlieren photography technique to capture an image of a cough.    From Wordnik.com.  [Nashuatelegraph.com local, state, business and sports news] Reference

Quite simply, if you want poetry to seem contemporary and relevant, this kind of design (and good design in general) can make all the difference schlieren photography "takes an invisible phenomenon and turns it into a visible picture.".    From Wordnik.com.  [Design Observer: Main Posts] Reference

" And he showed Mott a high-speed schlieren photograph of an unsatisfactory model perched atop a narrow steel pylon, more than a hundred minute wires leading from a hundred sensors mounted on various interior parts of the plane.    From Wordnik.com.  [Space]

"This full-scale schlieren image shows the discharge of a .44 Magnum revolver.    From Wordnik.com.  [بالاترین] Reference

At The image, published online Oct. 9 by The New England Journal of Medicine, was created by schlieren photography, which "takes an invisible phenomenon and turns it into a visible picture schlieren is German for" streaks "; in this case it refers to regions of different densities in a gas or a liquid, which can be photographed as shadows using a special technique. influenza and other diseases, surprisingly little is known about them.    From Wordnik.com.  [Clipmarks | Live Clips] Reference