Advanced Cicerone key terms

Matching the resistance of tubing, gravity, and applied gas pressure so beer dispenses at the intended flow rate and carbonation. Imbalance causes foaming, flat pours, or overly fast, turbulent flow that releases dissolved CO2.

The amount of dissolved carbon dioxide in beer, expressed as liters of gas per liter of liquid at standard conditions. Style targets range roughly from 1.5 volumes in cask ale to 4+ in wheat beers and Belgian gueuze.

A device in a draught system that senses foam reaching the beer line and shuts off flow, preventing beer loss and gas blow-by into the keg. It must be reset before service resumes.

Scheduled flushing of draught lines with caustic or acid cleaner followed by rinsing, typically every one to two weeks. Neglect causes biofilm, off-flavors, and false aroma faults in otherwise sound beer.

Secondary fermentation of beer in the cask with live yeast and residual sugar, producing natural carbonation. Requires venting, tapping, and careful handling; served at cellar temperature without applied gas pressure.

Dispensing beer with a nitrogen-rich gas blend through a restrictor plate, creating fine, cascading bubbles and a creamy, low-carbonation head. Common for dry Irish stout and some porters.

The vessel's geometry directs aroma, head retention, and the first sip. Tulips and snifters concentrate volatiles, pilsner flutes preserve carbonation, and shaker pints suit little beyond convenience.

A glass free of detergent residue, grease, and lint so foam laces the sides evenly. Residuals from improper rinsing kill head retention and can introduce soapy or fatty off-flavors.

The temperature at which beer is poured, chosen to balance aroma release and refreshment. Lagers often suit 4-7 C, ales 8-12 C, and strong or complex beers 12-16 C.

The cool storage and service temperature for cask and keg beer, traditionally around 11-13 C in British cellars. It keeps beer stable while letting malt and yeast character show.

How long a beer's foam persists after pouring. It depends on protein-polyphenol complexes, hop acids, carbonation, glass cleanliness, and alcohol level, and is a visible quality indicator.

A scale for beer color based on light absorbance at 430 nm through a standard cell. Values run from about 2 for pale lagers to 40+ for imperial stouts.

A European color scale similar to SRM but with larger numbers; roughly EBC equals SRM multiplied by 1.97. Brewers use it to specify malt and finished beer color.

A measure of iso-alpha acid concentration in beer in parts per million. It estimates bitterness but not perceived intensity, which also depends on malt sweetness, carbonation, and hop aroma.

The ratio of bitterness units to original gravity units (last two digits of OG), used to judge balance. A ratio near 0.5 suggests malt-forward beer; above 1.0 suggests hop-forward.

The density of wort before fermentation, usually expressed as specific gravity or degrees Plato. It indicates fermentable sugar content and predicts potential alcohol and body.

The density of beer after fermentation, showing residual unfermented sugars and body. The drop from original gravity determines alcohol content and hints at attenuation.

The percentage of sugars a yeast strain consumes during fermentation. High attenuation yields dry, thin beer; low attenuation leaves sweetness and body, shaping style character.

The degree of kilning or roasting a malt receives, which determines its contribution to beer color and flavor. Pale malt adds little color; chocolate and black malt add deep color and roast notes.

Traditional low-alpha European hop varieties such as Hallertau, Tettnang, Saaz, and Spalt. They give delicate floral, herbal, and spicy aromas and underpin many lager and Belgian styles.

Adding hops during or after fermentation to extract aroma without much bitterness. It contributes fresh, resinous, or fruity notes but can raise pH and risk grassy or vegetal character if overdone.

Fermentation-derived aromas from Belgian strains, including banana, clove, pepper, and fruity esters. Phenolic and ester levels are strain-specific and define styles like saison, witbier, and dubbel.

A broad family using a significant share of malted or unmalted wheat, giving pale color, soft body, and hazy appearance. Includes German Weissbier, Belgian witbier, and American wheat ale.

A Belgian farmhouse ale, typically pale, highly attenuated, and dry, with peppery, fruity yeast character and firm bitterness. Historically brewed in cooler months for summer farm labor.

Aromatic compound formed during fermentation by yeast, producing fruity notes such as banana, pear, apple, or pineapple. Ester levels depend on strain, temperature, and gravity.

Aromatic compound contributing spicy, clove, smoky, or medicinal notes. Some phenols are desirable in Belgian and smoked beers; excessive chlorophenol from sanitizer residue reads as band-aid.

A buttery or butterscotch off-flavor from a fermentation intermediate, often due to premature cooling or weak yeast. It is acceptable in small amounts in some English styles but a fault in lagers.

A green apple or grassy aroma from an intermediate in alcohol formation. It signals incomplete fermentation or early packaging and is a fault in most styles.

A cooked-vegetable or sweet-corn aroma, often from S-methylmethionine in malt and insufficient kettle boil or rapid chilling. Small amounts suit some pale lagers; higher levels are a fault.

The skunky or catty aroma from iso-alpha acids reacting with ultraviolet light. Brown bottles and dark storage reduce risk; clear and green glass offer little protection.

Bitter compounds formed when alpha acids from hops isomerize during the boil. They provide most of beer's bitterness and are the basis of IBU measurement.

Volatile compounds from hops, including terpenes and thiols, that give citrus, pine, floral, or tropical notes. Aroma fades with age and heat, so fresh beer shows it best.

The enzymatic breakdown of malt starches into fermentable sugars during the mash. It depends on temperature, pH, water chemistry, and diastatic power of the malt.

A malt's capacity to produce enzymes that convert starch to sugar, measured in degrees Lintner. Highly modified pale malts have high power; roasted malts have little or none.

The acidity of the mash, ideally around 5.2-5.6 for most beers. It affects enzyme activity, hop utilization, fermentation, and clarity, and is adjusted with water salts or acid.

The mineral profile of brewing water, especially calcium, magnesium, sulfate, and chloride. Sulfate accentuates hop bitterness; chloride rounds malt sweetness, so the ratio shapes flavor.

Any malt beyond a base pale malt, used for color, body, and flavor. Examples include crystal, chocolate, black, and roasted barley, added in smaller proportions.

Choosing a yeast for its fermentation profile, flocculation, attenuation, and flavor contribution. The same wort can become a crisp lager or a fruity ale depending on the strain.

A pairing approach that matches shared flavors, such as roasted malt with grilled meat or citrus hops with lemon. It creates harmony rather than deliberate contrast.

A pairing that uses contrast to refresh the palate, such as a crisp pilsner with rich fried food or a hoppy beer with fatty cheese. Carbonation and bitterness cut through fat and salt.

Matching beer with cheese by intensity and texture, using acidity and carbonation to cleanse fat. Hoppy beers suit sharp cheddar, while malty dark beers pair with aged gouda.