Science and Extraction
Solubility, extraction yield, TDS, the brewing control chart, and refractometry.
Every cup of pour over is a chemistry experiment you can drink. Hot water meets ground coffee, dissolves a fraction of its mass, and carries that fraction into your cup. This domain explains the science underneath the ritual — what actually dissolves, how much of it, how we measure the result, and why two brewers with the same coffee can land in wildly different places. Understanding it turns guesswork into control, and turns "this tastes off" into "this is under-extracted, so I'll grind finer." 🎯
#The Core Idea
Brewing is extraction: water pulls soluble compounds out of roasted coffee, and the art is taking the right amount of the right compounds. Take too little and the cup is sour and thin; take too much and it turns bitter and hollow. Two independent numbers describe where you landed — how much coffee dissolved (extraction yield) and how concentrated the result is (TDS). Almost everything else in this knowledge base — grind, water, temperature, technique — is a lever that moves those two numbers.
Numbers are a map, not the territory. A refractometer tells you where you are; your palate decides whether you like it. Use the science to repeat good cups, not to chase a target you can't taste.
#What This Domain Covers
| Topic | Note |
|---|---|
| What extraction is | The Science of Extraction |
| What dissolves, in what order | Solubility and What Dissolves |
| The two independent axes | Extraction Yield and Strength |
| Measuring concentration | Total Dissolved Solids (TDS) |
| The classic chart | The Coffee Brewing Control Chart |
| Measuring extraction | Refractometers and Measuring Extraction |
| Reading the cup | Under-Extraction and Over-Extraction |
| When beds extract unevenly | Channeling and Uneven Extraction |
| Heat and solubility | The Role of Temperature in Extraction |
| Surface area | Grind Size and Surface Area |
| Why fresh coffee bubbles | CO2, Degassing, and the Bloom Science |
#How It Connects Outward
The science here is the why behind every practical choice elsewhere. When you adjust grind size you are changing surface area and extraction rate; when you follow The Bloom you are managing CO2; when a cup disappoints, the troubleshooting guide reasons in this domain's language. Sensory work in Tasting and Sensory is the human counterpart — extraction theory predicts the flavor, tasting confirms it.
#Continue Reading
- The Science of Extraction — start here: what extraction actually is
- Extraction Yield and Strength — the two numbers that define your cup
- Under-Extraction and Over-Extraction — diagnose and fix by taste
- The Coffee Brewing Control Chart — the famous map of brewing space
- Home — back to the top of the knowledge base