Beer Styles and Beer Characteristics
This domain tests whether you can identify a beer's style from measurable and sensory evidence, then explain which brewing decisions produced that profile. Expect questions that pair a short sensory description with gravity, bitterness, and color numbers.
Core rules
- Style identity is a combination of original gravity/ABV, bitterness (IBU), color (SRM), fermentation character, and balance - never one number alone.
- Know the families: lagers versus ales, then malt-forward, hop-forward, sour, smoked, and wood-aged within each.
- Calculate before you name: ABV = (OG − FG) × 131.25; apparent attenuation = (OG − FG) ÷ (OG − 1) × 100.
- Use BU:GU (IBU ÷ gravity points above 1.000) as a balance shortcut: roughly 0.5 is balanced, above 0.8 is decisively hop-forward.
- Sensory descriptors map to process: citrus/pine = American hops; banana/clove = Bavarian wheat yeast; sulfur = lager fermentation; acetic = oxygen exposure.
Worked example
A pale beer measures OG 1.052, FG 1.011, 40 IBU, 6 SRM, with clean neutral ale fermentation and citrus-resin aroma but almost no malt sweetness. ABV = 0.041 × 131.25 ≈ 5.4%. Attenuation = 0.041 ÷ 0.052 ≈ 79%. BU:GU = 40 ÷ 52 ≈ 0.77. Clean American ale yeast rules out Belgian and British character; color and gravity are too low for IPA; bitterness is too high relative to malt for a blonde ale. The answer is American Pale Ale.
Traps that cost marks
- Confusing "bitter" with "hoppy": IBU measures isomerized acid, while aroma comes from late and dry hops.
- Treating SRM as a flavor scale - a dark beer can be smooth and low in roast.
- Ignoring attenuation: 1.060 to 1.020 is a sweet, full beer regardless of IBU.
- Reciting style ranges without linking them to yeast, water, and malt choices.
- Forgetting that alcohol warmth and body often decide between adjacent styles.