Think about pressing f11 to go in and out of
full screen mode
.jpg "Theakstons Tap Stream")
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.jpg "A variation on the Original Guinness widget with the addition of tube like on a Biro pen.")
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The idea was that the gas was released above the top of the Lager and not in the liquid thus sending it flying out through the top of the can.
.jpg "Murphys Stout and Fuggles Imperial Draughtflow")
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The thing that gives your draught beer in a can its head, is now commonly known as a "Widget".
It was invented by Guinness in the early 1980's.
It is simply a small piece of plastic with a small hole leading to a small volume
of air, which of course, is mostly nitrogen.
This widget is placed into the can before
the beer, then the beer is poured in, and the can is sealed. Apparently then the
beer becomes naturally pressurised, which forces a small amount of beer (1%) into
the widget. This small amount of beer, as a result, displaces and therefore pressurises
the air within the small volume of the widget.
When the can is opened, the entire
contents come back down to atmospheric pressure. More importantly, the pressurised
air in the widget gets forced out through the small hole in the widget with a great
Fizz, aerating the beer in a similar manner that it was 200 years ago, and as if
by magic, a perfect creamy head.
See more information about Widgets, visit "How stuff works" at; http://www.howstuffworks.com/question446.htm
.jpg "Tetleys")
.jpg "Paper fan")
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