| Term | Definition |
|---|---|
| Brewpub | Pub that makes its own beer and sells at least 50% of it on premises. Also known in Britain as a home-brew house and in Germany as a house brewery.
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| Bright Beer Tank | See conditioning tank.
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| Brilliancy | Property (of a beer) of being transparent and sparkling.
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| British Thermal Unit (BTU) | Amount of heat required to raise the temperature of one pound of water, Unit (BTU) one degree Fahrenheit.
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| Budding | The production of new yeast cells as buds from mother cells.
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| Buffer | Any substance, or combination of substances, which when dissolved in water produces a solution which resists a change in its hydrogen ion concentration upon the addition of acid or alkali.
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| Bung | The stopper in the hole in a keg or cask through which the keg or cask is filled and emptied. The hole may also be referred to as a bung or bunghole. Real beer must use a wooden bung.
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| Bunging | To close a container with a bung or to connect a container to a pressure- regulating system; to maintain a certain counter pressure of CO2.
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| Butterscotch | See diacetyl. A volatile compound in beer that contributes to a butterscotch flavor, measured in parts per million.
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