Bảng chú giải bia

Brewing Basics

Hot Break

Clumps of coagulated proteins and tannins that form during the vigorous boil. Hot break appears as flaky, egg-drop-soup-like particles floating …

Whirlpool

A post-boil technique where wort is stirred rapidly and then allowed to settle, causing hot break material and hop debris …

Wort

The sweet, sugar-rich liquid extracted from the mash before fermentation. Wort contains fermentable sugars, proteins, hop compounds, and minerals that …

Boil

The vigorous boiling phase after lautering, typically lasting 60-90 minutes. Boiling sterilizes the wort, isomerizes hop alpha acids for bitterness, …

Original Gravity (OG)

A measurement of the density of wort before fermentation, expressed as a specific gravity value (e.g., 1.050). OG indicates the …

Sparging

Rinsing the grain bed with hot water during lautering to extract residual sugars. The three main techniques are fly sparging …

Gravity Points

A simplified way to express specific gravity by dropping the leading '1.0' — a wort at 1.048 has 48 gravity …

Final Gravity (FG)

The specific gravity of beer after fermentation is complete, reflecting residual unfermented sugars and dissolved solids. A lower FG relative …

Lautering

The separation of sweet wort from spent grain after mashing. The grain bed acts as a natural filter; the brewer …

Mashing

The process of soaking crushed malted grain in hot water to activate enzymes that convert starches into fermentable sugars. Mash …

Fermentation

Acetaldehyde

A fermentation intermediate with a green-apple or raw-pumpkin aroma. Acetaldehyde is a precursor to ethanol; healthy yeast reduce it during …

Pitching Rate

The quantity of yeast cells added to wort at the start of fermentation, typically expressed as millions of cells per …

Krausen

The thick, foamy head that forms on top of fermenting beer during the most active phase of fermentation. High krausen …

Lagering

The cold storage and conditioning phase of lager production, traditionally conducted near 32-40 °F (0-4 °C) for weeks to months. …

Attenuation

The percentage of wort sugars consumed by yeast during fermentation, calculated from the difference between original and final gravity. Apparent …

Cold Crash

Rapidly chilling fermented beer to near-freezing temperatures (32-38 °F / 0-3 °C) to encourage yeast, proteins, and other haze-forming particles …

Ester

Aromatic compounds produced by yeast during fermentation that contribute fruity flavors and aromas to beer. Common esters include isoamyl acetate …

Flocculation

The tendency of yeast cells to clump together and settle out of suspension after fermentation. High-flocculation strains drop clear quickly, …

Phenol

A class of aromatic compounds that produce spicy, smoky, or medicinal flavors in beer. Desirable phenols include the clove-like 4-vinylguaiacol …

Diacetyl

A fermentation byproduct with a buttery or butterscotch flavor and aroma. While acceptable at low levels in some English ales …

Hop Science

Alpha Acid

The primary bittering compounds in hops, expressed as a percentage of the hop cone's weight. During the boil, alpha acids …

Dry Hopping

Adding hops to beer after fermentation (or during late fermentation) without heat, extracting volatile oils and aromatic compounds while adding …

IBU

International Bitterness Units, a measurement of the concentration of isomerized alpha acids in beer. One IBU equals one milligram of …

Beta Acid

Hop compounds that do not isomerize during the boil but slowly oxidize over time into bitter compounds. While less immediately …

BU:GU Ratio

The ratio of bitterness units (IBU) to gravity units, used to estimate the balance between hop bitterness and malt sweetness. …

First Wort Hopping

Adding hops to the kettle during lautering, before the boil begins. The hops steep in the hot wort as it …

Hop Creep

An unintended refermentation caused by enzymes present on hop matter during dry hopping. These enzymes (primarily amyloglucosidase) break down residual …

Hop Oils

Volatile aromatic compounds found in hop lupulin glands, including myrcene (herbal, resinous), humulene (spicy, earthy), caryophyllene (woody, peppery), and linalool …

Lupulin

The yellow, resinous powder found at the base of hop cone petals (bracts), containing concentrated alpha acids, beta acids, and …

Whirlpool Hop

Hops added during the whirlpool or hop stand phase, after the boil has ended and wort temperature drops to 170-200 …

Malt & Grain

Adjunct

Any non-barley fermentable added to the grain bill, including corn, rice, wheat, oats, rye, sugar, and honey. Adjuncts can lighten …

Base Malt

The primary grain in a beer recipe, providing the bulk of fermentable sugars and the enzymatic power (diastatic power) needed …

Crystal Malt

A specialty malt that undergoes saccharification inside the husk before kilning, creating glassy, crystalline sugar structures. Available in a spectrum …

Maillard Reaction

A complex chemical reaction between amino acids and reducing sugars that occurs during kilning and wort boiling, producing melanoidins — …

Modification

The degree to which the barley endosperm has been broken down during the malting process. Well-modified malts have fully degraded …

Specialty Malt

Kilned or roasted malts used in small quantities to add color, flavor, and body to beer. Examples include crystal/caramel malts …

Diastatic Power

A measure of a malt's enzymatic ability to convert starch into fermentable sugars, expressed in degrees Lintner. Pale malts have …

Grain Bill

The full list of grains and their proportions used in a beer recipe. The grain bill determines the color, body, …

Kilning

The controlled drying and heating of malted grain to halt germination and develop color and flavor. Pale kilning at low …

Lovibond (SRM)

A scale measuring the color intensity of malt and beer. SRM (Standard Reference Method) replaced degrees Lovibond for beer, but …

Beer Styles

Barleywine

A strong ale (8-14% ABV) with intense malt sweetness, complex fruit esters, and significant alcohol warmth. English barleywine emphasizes toffee, …

Session Beer

A beer with relatively low alcohol content (typically under 5% ABV) designed for extended, multi-pint drinking sessions without excessive intoxication. …

Pilsner

A pale lager style originating in Pilsen, Bohemia in 1842, featuring brilliant clarity, noble hop bitterness, and crisp malt character. …

Ale

A broad category of beers fermented with top-fermenting Saccharomyces cerevisiae yeast at warm temperatures (60-75 °F / 15-24 °C). Ales …

BJCP

The Beer Judge Certification Program, a non-profit organization that certifies beer judges, publishes style guidelines, and sanctions homebrew competitions. The …

India Pale Ale (IPA)

A hop-forward ale style originally brewed in England for export to India, now the flagship of the American craft beer …

Lager

A category of beers fermented with bottom-fermenting Saccharomyces pastorianus yeast at cool temperatures (45-55 °F / 7-13 °C), followed by …

Stout

A dark, top-fermented beer style brewed with roasted barley or malt, producing flavors of coffee, chocolate, and caramel. Sub-styles include …

Wheat Beer

A family of ales and occasional lagers brewed with a significant proportion (typically 50%+) of wheat malt. German Hefeweizen features …

Sour Beer

A category of beers intentionally acidified by Lactobacillus, Pediococcus, or Brettanomyces. Traditional sour styles include Belgian Lambic, Gueuze, Flanders Red, …

Packaging & Serving

Beer Glassware

Purpose-designed glasses that enhance the drinking experience for specific beer styles. The tulip concentrates hop aromas for IPAs; the Weizen …

Bottle Conditioning

Carbonating beer naturally by adding priming sugar (or fresh wort) before sealing in bottles. Residual or added yeast ferments the …

Draft System

The complete setup for dispensing kegged beer, including kegs, gas cylinders (CO2 or nitrogen), regulators, beer lines, faucets, and a …

Nitro Pour

A serving method using a nitrogen-CO2 gas blend (typically 75% N2, 25% CO2) pushed through a restrictor plate. Nitrogen creates …

Carbonation

Dissolved carbon dioxide in beer, measured in volumes of CO2. Most beers range from 2.0 to 3.0 volumes; British cask …

Force Carbonation

Dissolving CO2 into beer by applying pressurized gas from a CO2 tank, typically in a Cornelius keg. Set-and-forget methods use …

Cask Ale

Unfiltered, unpasteurized beer that undergoes secondary fermentation and conditioning in the cask (firkin) from which it is served. Cask ale …

Crowler

A 32-ounce aluminum can filled and seam-sealed on demand at a taproom or brewery. Crowlers combine the portion size of …

Growler

A reusable container — traditionally a 64-ounce glass jug — filled directly from a draft tap at a brewery or …

Serving Temperature

The optimal drinking temperature for a beer style, which affects aroma volatility, flavor perception, and mouthfeel. Light lagers serve best …

Sensory & Tasting

Beer Clarity

The visual transparency of beer, ranging from brilliant (perfectly clear) to hazy or opaque. Clarity depends on yeast flocculation, protein-tannin …

Chill Haze

A temporary haze that appears when beer is chilled below 32 °F (0 °C) and clears as it warms. Caused …

Head Retention

The persistence and quality of foam on top of poured beer. Good head retention depends on proteins (especially from wheat …

Off-Flavor

Any flavor or aroma in beer that is unintended, undesirable, or inappropriate for the style. Common off-flavors include diacetyl (butter), …

Flavor Threshold

The minimum concentration of a compound at which it becomes detectable in beer. Flavor thresholds vary between individuals and are …

Light-Struck

A skunky off-flavor caused by UV light reacting with isomerized hop compounds (iso-alpha acids) to produce 3-methyl-2-butene-1-thiol (MBT). Green and …

Mouthfeel

The tactile sensation of beer in the mouth, encompassing body (thin to full), carbonation level (flat to effervescent), astringency (puckering), …

Oxidation

Chemical degradation of beer caused by exposure to oxygen after fermentation, producing papery, cardboard, sherry-like, or wet-paper flavors. Oxidation accelerates …

Lacing

The patterns of foam residue left on the inside of a glass as beer is consumed. Good lacing — rings …

DMS (Dimethyl Sulfide)

A sulfur compound that produces a cooked corn, creamed corn, or cooked vegetable aroma in beer. DMS is formed from …

Equipment

Airlock

A one-way valve fitted to the fermenter that allows CO2 to escape during fermentation while preventing outside air, bacteria, and …

Cornelius Keg

A 5-gallon stainless steel pressure vessel originally designed for the soft drink industry, widely adopted by homebrewers for draft beer. …

pH Meter

An electronic instrument for measuring the hydrogen ion concentration (acidity/alkalinity) of mash and wort. Mash pH should target 5.2-5.6 for …

Brew Kettle

The vessel used to boil wort with hops. Brew kettles range from stovetop stock pots (5-10 gallon homebrews) to multi-barrel …

Fermenter

The vessel where cooled wort is pitched with yeast for fermentation. Common types include plastic buckets, glass carboys, stainless steel …

Hydrometer

A glass instrument that measures the specific gravity (density) of a liquid by floating at different levels depending on sugar …

Wort Chiller

A heat exchanger used to rapidly cool boiled wort to pitching temperature. Immersion chillers (copper coils in the kettle), counterflow …

Sparge Arm

A rotating or fixed device that distributes hot sparge water evenly over the grain bed during lautering. Even water distribution …

Mash Tun

The vessel where crushed grain is mixed with hot water for mashing. Homebrewers often use insulated coolers with false bottoms …

Refractometer

An optical instrument that measures sugar concentration in a liquid by measuring how much light bends as it passes through …

Beer History

Anchor Steam

Anchor Brewing Company in San Francisco, founded in 1896 and revived by Fritz Maytag in 1965, is widely regarded as …

Burton-upon-Trent

An English town renowned as the historic capital of British brewing, famed for its mineral-rich water high in calcium sulfate …

Lambic Tradition

The centuries-old Belgian practice of spontaneous fermentation, where wort is cooled overnight in a shallow coolship vessel, exposed to wild …

Homebrew Legalization

The 1978 U.S. federal law (signed by President Carter) that legalized home brewing of beer and wine for personal consumption. …

Monastery Brewing

The medieval tradition of brewing within religious communities, particularly Benedictine and Trappist monasteries, which were among the first institutions to …

Pale Ale Revolution

The 18th-century shift from dark, smoky beers to clear, pale ales enabled by coke-fired kilns that could dry malt without …

Prohibition

The period from 1920 to 1933 when the 18th Amendment to the U.S. Constitution banned the production, sale, and transportation …

Reinheitsgebot

The German Beer Purity Law of 1516, originally decreed in Bavaria, stipulating that beer could only be brewed from water, …

Trappist Beer

Beer brewed within the walls of a Trappist monastery under the supervision of the monastic community. Only 14 monasteries worldwide …

Pasteurization

The heat treatment of beer to kill spoilage microorganisms, named after Louis Pasteur who first explained fermentation scientifically in the …

Industry & Business

Craft Brewery

As defined by the Brewers Association, a craft brewery is small (under 6 million barrels annual production), independent (less than …

Brand Consolidation

The trend of large beer conglomerates (AB InBev, Molson Coors, Heineken) acquiring or investing in craft breweries. Major acquisitions include …

Barrel-Equivalent

A standard unit of measurement in the U.S. beer industry equal to 31 U.S. gallons (117.3 liters). Production volume, tax …

Brewers Association

The U.S. trade group representing small and independent American craft brewers, founded in 2005 from the merger of the Association …

Distribution Footprint

The geographic area where a brewery's products are available through wholesale distribution channels. Expanding distribution requires partnerships with regional or …

Taproom Model

A brewery business strategy focused on selling beer directly to consumers in an on-site taproom, maximizing profit margins by eliminating …

Three-Tier System

The U.S. alcohol distribution model established after Prohibition, requiring separation between producers (breweries), distributors (wholesalers), and retailers (bars, shops). Each …

Excise Tax

A federal and state tax levied on beer production or importation. U.S. federal excise tax is $3.50 per barrel for …

Franchise Law

State-level legislation governing the relationship between breweries and their distributors. Franchise laws typically make distribution agreements very difficult to terminate, …

Contract Brewing

An arrangement where a brand owner (the 'contract' or 'virtual' brewer) hires an existing brewery to produce beer according to …

Beer Culture

Beer Advent Calendar

A seasonal product containing 24 or 25 different beers, one for each day of December leading to Christmas. Beer advent …

Beer Garden

An outdoor drinking area, originating in 19th-century Bavaria where breweries planted chestnut trees above their underground lagering cellars to shade …

Beer Pairing

The practice of matching beer styles with complementary or contrasting foods to enhance both. Classic pairings include Belgian Witbier with …

Beer Tourism

Travel motivated by visiting breweries, beer festivals, historic brewing sites, and beer-centric destinations. Popular beer tourism destinations include Belgium (abbey …

Great American Beer Festival

The largest commercial beer competition and festival in the U.S., organized by the Brewers Association and held annually in Denver, …

Oktoberfest

The world's largest beer festival, held annually in Munich, Germany from late September to early October. Only six Munich breweries …

Pub Culture

The British tradition of the public house as a community institution for socializing, dining, and consuming cask ales. British pub …

Homebrew Club

An organized group of homebrewing enthusiasts who meet regularly to share recipes, techniques, and beers. Clubs often host competitions, group …

Zymurgy

The science of fermentation, derived from the Greek word 'zyme' (leaven). In brewing context, zymurgy encompasses the biochemistry of yeast …

Untappd

A popular social networking app for beer enthusiasts to check in, rate, and review beers. Launched in 2010, Untappd has …