May 11, 2012

The Science of Coffee Rings

Picture:Marina Dominguez/NPR

NPR has an interesting article on the science of coffee rings. Simple things like coffee rings can seem like they're easy to understand but in fact they're complicated. It's taken physicists more than a decade to figure out why this effect, known technically as "the coffee ring effect," happens.

Coffee, like many liquids, contains tiny, spherical particles. When a drop of the liquid dries, forces push the particles toward the edge, where they are deposited in a thick line. We love this thick line of coffee, and when it happens it's because spherical particles evaporated instead of long particles which just produce spread stains with no ring.

"When spheres reach the surface of the drop, their shape does not induce the same deformation." Without the deformation, the particles travel to the edge of the drop and form a ring.

Check out this video to see the particles in action:

Read More in: General News

Share this Article with others: social bookmarking

Related Articles:

Came straight to this page? Visit Single Serve Coffee for all the latest news.

Posted by Jay Brewer at May 11, 2012 7:58 AM
Recent Comments
Post a comment

Remember personal info?

Please enter the letter "r" in the field below:
Please press Post only once. Submission of comments takes up to 20 seconds because of Spam Filtering.
Join the Mailing List Mailing List
Enter your Email

Subscribe - RSS

facebook_badge.jpg twitter_badge.jpg

Recent Reviews
Recent Comments
jennifer: i love my new Keurig k450.2.0 its the best read more
Perry Kittrell: I have been stationed in various countries and my favorite read more
shirley Feuling: Where can I get the brewer maintainance accessory? thanks read more
Glenn Stump: Does Sologrind make a MUG KUP that will work in read more
Nancy: Coffee is great kpods break open waste of money read more
SSC Forums


This weblog is licensed under a Creative Commons License.

Visit our other properties at!

All items Copyright © 1999-2016 Blogpire Productions. Please read our Disclaimer and Privacy Policy