Beer and Brewing History, Processes, and Styles

Vocabulary flashcards covering the historical evolution, core terminology, scientific measurements, step-by-step production stages, and distinct styles of beer and brewing.

Brewing

The combined processes producing beverages from the conversion of starch to sugar and fermentation by yeast of the resulting sugary solution to alcohol/ethanol and $CO_2$.

Beer

A fermented drink made from malted cereals, water, and yeast.

Drunken Monkey Hypothesis

The hypothesis proposing that odors of ripe and fermenting fruit helped primates locate calories in rain forests due to a genetically based behavioral attraction to the alcohol molecule.

The Code of Hammurabi

One of history's earliest legal systems ($1750\,\text{BCE}$ in Babylon) that required standard measures for serving beer and decreed death by drowning for any tavern keeper or brewer caught watering down beer or overcharging.

Cerevisia

Celtic wheat beer that was popular in climates where grapes could not be easily cultivated.

Gruit

A mix of plants—such as yarrow, carrot seeds, mugwort, and henbane—historically used to flavor beer prior to the widespread use of hops.

Reinheitsgebot

The $1516$ Bavarian Beer Purity Law that dictated beer had to be made exclusively from barley, hops, and water.

Hydrometer

An instrument used to measure the density of a liquid, utilized in brewing to determine sugar extraction from malt.

Chicha

A sacred Peruvian beverage made from corn, central to religious ceremonies, festivals, and political events, historically brewed only by women of noble birth or exceptional beauty.

Craft Brewer

A small (annual production of $6\,\text{million}$ barrels or less) and independent (less than $25\%$ owned or controlled by a non-craft beverage alcohol industry member) American brewer as defined by the Brewers Association.

Malting

The process of soaking, sprouting, and drying cereal grains to activate enzymes that turn complex starches into simple sugars.

Acrospire

The shoot produced by a barley seed embryo as it germinates.

Base Malts

Lightly kilned malts, such as pale malt or lager/pilsner malt, used in high percentages to provide starch and enzymes needed to convert starch into sugar.

Maillard Reactions

Non-enzymatic browning chemical reactions between amino acids and reducing sugars under heat that alter the flavor, aroma, and color of malts.

Brewing Liquor

Water prepared and used as an ingredient in beer making, often stored in a hot liquid tank.

Grist

Broken pieces of grain and husks created by milling malted cereal grain.

Strike Water

Warm water added to grist during the mashing process.

Mash Tun

The vessel used to combine and hold grist and warm water during mashing.

Saccharification Rest

A mash rest period held at approximately $150\text{--}160^\circ$ for about $60\,\text{minutes}$ to convert starch into fermentable and unfermentable sugars.

Mash-out

The process of raising mash temperature high enough to stop enzymatic activity and reduce mash viscosity for easier liquid-grain separation.

Lautering

The process of separating sugar water (sweet wort) from spent grain.

Sweet Wort

The liquid separated from spent grain that contains fermentable and unfermentable sugars, proteins, amino acids, vitamins, and minerals.

Sparging

The action of rinsing spent grain with water to recover as much remaining sugar as possible.

Trub

Also known as hot break, the coagulated proteins and fats removed during boiling to improve beer clarity and stability.

Racking

The process of transferring beer from one vessel to another.

Pitching

Inoculating cooled, oxygenated wort with yeast.

Green Beer

Beer that has completed primary fermentation but is not yet fully conditioned, containing unpleasant fermentation by-products.

Cold Crash

Decreasing beer temperature to near freezing for $2\text{--}3\,\text{days}$ to cause insoluble solid materials to fall out of solution.

Lagering

Storing beer at cold temperatures near freezing for an extended period of time to clarify and mature the flavor profile.

Standard Reference Method (SRM)

A quantitative measurement scale for beer color based on the amount of light absorbed at $430\,\text{nm}$.

International Bitterness Units (IBU)

A quantitative measure of the amount of bitter compounds (iso-alpha acids) present in beer.

Original Gravity (OG)

The density of beer before fermentation, which measures both fermentable and unfermentable sugars.

Final Gravity (FG)

The density of beer after fermentation, measuring unfermented sugars remaining in the liquid.

Doppelbock

A strong German lager style with similar hop levels to a traditional bock but higher alcohol content ($7\text{--}10\%$ ABV).

Eisbock

A beer style produced by freezing a bock lager and removing the ice, creating a maltier flavor profile with higher ABV ($>8\%$).

Pre-Prohibition Lager

An American lager style developed by German immigrants who substituted $20\text{--}30\%$ of the grist with corn to compensate for high protein content in US barley.

Lambic

A naturally and spontaneously fermented Belgian ale style made with malted barley, unmalted wheat ($30\%$), aged hops, and aged in wooden casks.

Brewing Process Flow

The complete flow of beer production, beginning with barley undergoing steeping, germination, and kilning to become malt, followed by milling, mashing with water, wort separation, boiling with hops, clarification, cooling, pitching with yeast, fermentation, conditioning, filtration & stabilization, and packaging.