Beer is a brew that people have been drinking for centuries. Different cultures have been satisfying their need across the world for around 8,000 years. Using the basic ingredients of yeast, barley and hops, brewers have created their own unique blends. While some individuals will drink almost any form of beer, others are fanatically attached to a particular brew. They talk about the mouth feel, the color and the head, aspects resulting, in part from carbonation. While companies work carefully to obtain the right level of carbon dioxide (CO2), others are trying out the effects on the brew of another gas – nitrogen gas (N2), employing a nitro beer system.