I can see interference patterns in liquids and in light, but I don't see it in the air that surrounds us. I don't see leaves align in an interference pattern on the other side of a picket fence. The closest I could find after some googling was air moving over the surface of water. So I did thisenter image description here.The cigar smoke is drawn through the paint sprayer and shot through a double slit, made from razor blades and a very thin wire. A white piece of cloth is on the other side of the double slit. The smoke will stain where the air concentrates. Here's what I saw after burning four inches of a cigar.enter image description here So the question is why no interference pattern on the cloth or in nature?

  • $\begingroup$ The smoke is about 0.01 microns. The slit was just as tight as I could physically make it. Yes, I peeked. Just couldn't resist. $\endgroup$ – Lambda Sep 17 '16 at 16:52
  • $\begingroup$ The slit was tight enough to produce an interference pattern when a red laser beam passed through it. $\endgroup$ – Lambda Sep 17 '16 at 16:57
  • $\begingroup$ Did you read this physics.stackexchange.com/questions/38440/… just in case it has any relevance $\endgroup$ – user108787 Sep 17 '16 at 16:59
  • $\begingroup$ You know what did better than I do obviously, but this line in the link above caught my eye... Expand the beam with a lens. As long as you have one laser source, the fluctuations in intensity are correlated and you should have an easier time than with an incoherent source does that apply to your setup in any way , I wonder $\endgroup$ – user108787 Sep 17 '16 at 17:06

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