There’s nothing like the look of a creamy head on a homebrewed stout or the lacing on a glass after finishing a Belgian ale. But beer foam isn’t just about appearance. The bubbles from your beer impact carbonation level, aroma, flavor and body. Beer foam is a complicated and far from understood phenomenon. So, what is foam?
When you start homebrewing and make some research about recipes, equipment and raw materials, you’ll find that almost everything is based on some kind of codified volume : 5 gallons. You, of course, can brew larger batches but must modify things in equipment, ingredients and methods to your brewing.