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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
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