I’ve been thinking about this one for a long time now, and since I have the impression of there is some physics majors in T-Nation, I thought I’d ask here:
I came over this very fascinating next-generation TV technology called heliodisplay ( http://www.io2technology.com/ ).
It basicly project light beams (probobly infrared?) into the air, stop at 0,xxx meters, heats up the air very locally which makes use of the luminescense ( http://en.wikipedia.org/wiki/Luminescence ) princple and produces visual light of a certain wavelength. With many beams it creates a matrix of lights, which is a picture floating in the air.
Now what I don’t get, is how can an electromagnetic beam heat up the air at 0,113m but not at 0,112m?