How-To Geek

That Physics of Coffee Rings [Video]

The rings left behind by coffee cups are distinctly uniform in their distribution–the stain is always around the edge. This video from the University of Pennsylvania’s Physics Department demonstrates why.

Check out the above video to see the physics behind the ring-shaped stains and how altering the shape of the particulate in the liquid completely changes the shape of the stain.

The Coffee Ring Effect [via Neatorama]

Jason Fitzpatrick is a warranty-voiding DIYer who spends his days cracking opening cases and wrestling with code so you don't have to. If it can be modded, optimized, repurposed, or torn apart for fun he's interested (and probably already at the workbench taking it apart). You can follow him on if you'd like.

  • Published 11/12/12

Comments (3)

  1. Atakan

    ahhhh too much black and white with too much horror music

  2. Dave

    Being an avid coffee snob for over 50 years, this is cool. Who woulda thunk it?


    And if you lay on your back drinking beer, snowflakes will go in you eyes, ears and nose. This results in an early death due to being deaf, dumb and blind.

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