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-- where do the bubbles come from? (http://www.vcdhq.com/forum/showthread.php?threadid=84684)

where do the bubbles come from?

just poured myself a pint of frosty jack and i see a shitload of bubbles coming from the bottom of the pint glass.
where /why do the bubbles come from?
anyone know?

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Beer Glass Widget

quote:

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The term widget can also be used to refer to a laser-etched pattern at the bottom of a beer glass (common to lager pint glasses in the UK, but not to ale glasses) which serves a similar purpose as the beer can widget. Instead of producing creaminess in the beer, however, the glass widget serves to keep the beer from going flat. The widget in the base of a beer glass works by causing the CO2 to be released from the liquid which comes into contact with it, thus keeping the beer or soft drink "alive" (ie. fizzy) for longer (see nucleation.) While glass widgets work on any carbonated beverage, the result is considerably less noticeable with bottled or canned drinks, with the best results produced in draught lager or cider. The pattern of the etching can be anything from a simple circular or checquered design to a logo or text.

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isn't it dew to slight imperfections in the glass?
or is that something else...

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Arthur is right. The liquid is kept super-saturated with dissolved gas while under pressure in the can. When the pressure is released, the gas comes out of solution. Microscopic imperfections in the surface of the glass become nucleation sites in which bubbles of gas form.

The brewing process produces Carbon Dioxide gas (CO2) which is dissolved in the beer.

The pressure in the bottle holds the gas in its dissolved state. When the beer is poured, there is not as much pressure on the surface of the beer, so the CO2 comes out, stops being dissolved and forms into bubbles.

This usually happens where there are microscopic imperfections in the glass to start the bubbles off, explaining why the bubbles form into strings.

copy/paste

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You also get more bubbles if the glass is dirty so if you buy a pint and there's loads of bubbles in it... Ask for a clean glass

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