The Physics Of Filter Coffee Epub Work 〈90% LATEST〉

The grind size determines the surface area available for reaction. We define the specific surface area $S_v$ (surface area per unit volume). For a spherical particle of diameter $d$: $$ S_v = \frac6d $$ In filter coffee, a bimodal distribution often results from grinder burr geometry, creating "fines" (particles < 100 $\mu m$) and "boulders." Fines migrate through the bed, potentially clogging flow paths, while boulders create preferential channels.