A couple months ago I shared some GIFs of invisible things, and I finally got around to putting them together in this video:

When light travels through areas of different air density, it bends. You’ve probably noticed the way distant pavement seems to shimmer on a hot day, or the way stars appear to twinkle. You’re seeing light that has been distorted as it passes through varying air densities, which are in turn created by varying temperatures and pressures.

Schlieren Flow Visualization can be used to visually capture these changes in density: the rising heat from a candle, the turbulence around an airplane wing, the plume of a sneeze … even sound.  Special thanks to Mike Hargather, a professor of mechanical engineering at New Mexico Tech, who kindly provided a lot of these videos.

Notes

  1. luminoussphereofplasma reblogged this from ilovecharts
  2. kevin00101 reblogged this from skunkbear
  3. coolmitochondrion reblogged this from coolsciencegifs
  4. aliaena reblogged this from npr
  5. frozenembers reblogged this from brainbarnacles
  6. thispainshallpassaway reblogged this from contaminatedbreastcheese
  7. moistnuggetcollector reblogged this from krautspacemagic
  8. caddowen reblogged this from skunkbear
  9. winstonta reblogged this from vsquaredk
  10. enjoyableboredom reblogged this from coolsciencegifs
  11. airsoftgeek reblogged this from robert-downey-syndrome
  12. sensitively-indifferent reblogged this from vsquaredk
  13. vsquaredk reblogged this from lookatthisstory
  14. daubman reblogged this from 10threespookyone35
  15. bwyankee reblogged this from krautspacemagic
  16. krautspacemagic reblogged this from robert-downey-syndrome
  17. themodernvisage reblogged this from skunkbear
  18. quagmereloveless reblogged this from innerdg
  19. herocom89 reblogged this from red-dirt-roads
  20. jetdron reblogged this from toocats
  21. encyclopedia-fucktanica reblogged this from red-dirt-roads