When you pour beer into a glass, bubbles of carbon dioxide rise to the top. Then the malt proteins inside combine with these CO2 bubbles and form a coating on them, which preserves them and creates a stable flavorful foam that sits atop your drink. This foam (or collar) is an integral element of a beer that distinguishes it from other alcoholic drinks. It provides flavor, fragrance, and an inviting appearance, so you really should leave extra space for it in your glass.
The size and shape of a beer glass is really about presentation. A freshly poured glass of beer should have a decent, lasting head of foam. If you are looking to pour all 12 ounces at once you'll need a bigger glass to enjoy that head formation.
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