Why do bubbles in Guinness beer move down instead of up? Detailed answer

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Why do bubbles in Guinness beer move down instead of up? Detailed answer

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Why do bubbles in Guinness beer move down instead of up?

In Guinness beer, you can clearly see how the bubbles go down the walls of the glass instead of going up. This is due to the fact that in the central part of the glass, the bubbles rise rapidly, pushing the liquid down at the edges with stronger viscous friction. But this effect is typical not only for Guinness, but in general for any liquid, it is just more noticeable in this beer. This is primarily due to the fact that instead of carbon dioxide, Guinness is filled with nitrogen, which is less soluble in water. Secondly, light bubbles are simply more visible against a very dark beer.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

What is an operetta?

Operetta is a form of light musical theater. This is a sentimental drama set to music. The setting in an operetta is usually a plausible world or an exotic location that is created by colorful sets and costumes. Many of the main characters are princes and princesses, men wearing officer uniforms and ladies in elegant dresses. As for the content of the operetta, it is almost always some kind of sentimental love story. Good people triumph, evil people are punished, lovers eventually unite.

The operetta originated in German-speaking countries towards the end of the XNUMXth century. Franz von Suppe is the man who truly created this form of musical theatre. He emphasized romance and feeling rather than comedy. He was one of the first composers to give the waltz an important role in the musical score, and thereafter most operettas included large waltz scenes. Johann Strauss wrote some of the most famous operettas and created the main features of the genre. His operetta Die Fledermaus is probably one of the most popular operettas ever written. It is still being revived on many stages around the world.

The second most famous operetta ever written is probably The Merry Widow by Franz Lehár. At the end of the XNUMXth century, operettas became popular in the United States, and soon there were many American composers who wrote very famous operettas. Among them were Victor Herbert, who wrote Children in Toyland and Capricious Marietta, and Rudolf Friml, who wrote Rosemary and The Tramp King. Perhaps the last American composer to write great operettas was Sigmunt Romberg, who wrote such famous operettas as Desert Song and New Moon. Operetta was a form of entertainment that gave millions of people great pleasure.

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A programmer from Sweden named Johan Kanflo created a single board computer in the form factor of an AA battery. The computer is inserted into a regular battery slot and can function as a computing device in various DIY gadgets.

The programmer called his invention AAduino, as it is a scaled-down clone of the famous Arduino single-board computer. Kanflo came up with the idea of creating a computer in battery format - he needed a miniature and autonomous computing device to assemble a pocket radio node.

To get started with the AAduino, you just need to plug it into the battery slot, observing the reverse polarity. The computer can be powered by batteries inserted into the remaining free slots in the compartment.

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Such a computer can be useful for inventors and lovers of homemade electronics. The AAduino is very easy to integrate into DIY gadgets as it requires only one AA battery compartment which is easy to find.

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