Subscribe
Subscribe
MY AMERICAN SCIENTIST
LOG IN! REGISTER!
SEARCH
 
Logo IMG
HOME > MULTIMEDIA > Multimedia Detail

SCIENCE IN THE NEWS DAILY

Falling Stout Bubbles Explained

from BBC News Online

Irish mathematicians may have solved the mystery of why bubbles in stout beers such as Guinness sink: it may simply be down to the glass. Simulations suggest an upward flow at the glass's centre and a downward flow at its edges in which the liquid carried the bubbles down with it.

But the reasons behind this flow pattern remained a mystery. Now a study on the Arxiv server reports simulations and experiments showing the standard glass' shape is responsible.

Many stout beers contain nitrogen as well as the carbon dioxide that is present in all beers. Because nitrogen is less likely to dissolve in liquid, that results in smaller and longer-lasting bubbles. But it is the sinking bubble that has confounded physicists and mathematicians alike for decades.

Read more...


comments powered by Disqus
 

Connect With Us:

Facebook Icon Sm Twitter Icon Google+ Icon Pinterest Icon RSS Feed Instagram Icon

Latest Multimedia

Flooded Sign

PODCAST & VIDEO: Engineering Around Extreme Events

Extreme events, such as super floods and hurricanes, are becoming more common, so civil engineers are trying to adapt civil infrastructure such as bridges to these unpredictable and sometimes devastating meteorological events. Engineer Ana Barros discusses how engineering can prepare us for extreme weather events, but also how changing climate and population conditions can affect the ability of infrastructure to hold up over time.

To view all multimedia content, click "Latest Multimedia."



RSS Feed Subscription

Receive notification when new content is posted from the entire website, or choose from the customized feeds available.


EMAIL TO A FRIEND :

Subscribe to American Scientist