Originally Posted by Chairman Cheyco
Let me know if you figure out a way to get the nitrogen back inside them.
One more time... sing along if you know the words.
There is no nitrogen in the widget. The widget is placed empty (or, more accurately, full of air) into the bottle/can and the beer is added. Then, a drop of liquid nitrogen is added to the brew and the container sealed.
The nitrogen starts to evaporate, increasing pressure in the container. This forces beer into the widget through the one little tiny hole, compressing the air that was in the widget to begin with.
When the bottle/can is opened, the pressure is released, and the compressed air in the widget pushes the beer out of the little hole with jet-force. This stream of bear knocks all of the teeny bubbles of CO2 out of solution and creates the creamy head.
PS: All of this information comes from having read the patent on the widget, which is available on-line.
PSS: Obligatory text, signing and smiley from my son; JIUUUIUUOUO9UIU