Living · 6 pages · 12 min
Why a grind coarser or finer changes a cup
Finer particles expose more surface, so water extracts more in the same time.
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From the opening
A coarser or finer grind changes a cup because it changes how much of the bean water can reach in the time you give it. Finer particles have more surface and a shorter path into the interior, so solubles leave faster than they do from coarse chunks. The opening covers more surface extracts faster, a coarse center stays dry, and particle size also controls flow.
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Inside
- More surface extracts faster
- A coarse center stays dry
- Particle size also controls flow
- Uneven blades mix two extracts
- Where the idea stops applying
- A distinction worth keeping
Sources
- Surface area and diffusion in coffee extraction
- The distinction between brew strength and extraction yield