Comments on: Why Do Coffee Rings Form? Because the Grounds are Round

By: Tony

Tony — Wed, 24 Aug 2011 15:19:06 +0000

Hmm – interesting! Can this finding be applied to the Universe? It’s commonly been said that the universe is expanding. Could it be, instead, that all the round particles (planets, moons, suns, etc.) are simply moving to the edge of the droplet?

By: Himadri

Himadri — Wed, 24 Aug 2011 14:49:35 +0000

I wonder why the particulates in the filtrate (the stuff we drink ) are so round? Do these particulates get their structure when they are growing in the pod, or are they the result of grinding? Are they coffee with non-spherical particles?

By: Kevin

Kevin — Sat, 20 Aug 2011 05:16:36 +0000

Cho vay tin chap, vay tieu dung, vay khong the chap, khong can chung minh thu nhap, luong tu 2 trieu la co the vay!

By: Mark

Mark — Sat, 20 Aug 2011 05:15:55 +0000

Thanks…no need to read the article. The title says it all.

By: Glen

Glen — Sat, 20 Aug 2011 05:14:48 +0000

WTF is digg staff’s fascination with coffee rings all of a sudden? pick some good stories.

By: Jadan

Jadan — Sat, 20 Aug 2011 05:14:02 +0000

On the bright side, I’ve gotten to know all the names of the Digg staff lately.

By: Andrew

Andrew — Sat, 20 Aug 2011 05:11:29 +0000

There’s a 37% chance it’s Rich’s fault.

By: Iain

Iain — Fri, 19 Aug 2011 02:20:23 +0000

@crow
Read the article. Depends on the coffee bean particulate shape, which is always round.
THIMK! (sic)

By: Crow

Crow — Thu, 18 Aug 2011 12:00:22 +0000

So is there a difference in behavior between burr ground coffee rings and blade ground?

By: Alexander Hollins

Alexander Hollins — Wed, 17 Aug 2011 21:24:56 +0000

aaron, not that kind of coffee ring. Put a drop of coffee on a surface, no cup involved, and when it dries, it will be a ring.

By: Aaron

Aaron — Wed, 17 Aug 2011 19:13:14 +0000

This phenomenon is neat and all, but coffee rings form the way they do because of the shape of the bottom of a coffee mug. Generally, only the outer edge of the mug contacts the table (or the coaster, for the prepared), and the coffee will dry in whatever shape the mug’s base makes contact in. I.e., a hexagonal mug will make coffee hexagons. New Christmas present for geometers?

By: Georg

Georg — Wed, 17 Aug 2011 18:47:35 +0000

Aha,
perfect spheres (and all the saḿe size!) by grinding coffee beans?
Coffee contains some oil, ans that is what the “particles” = droplets look like.
Georg