The Physics Of Filter Coffee — Pdf

To manipulate the physics of extraction in your kitchen, you must control four primary interconnected variables: Physical Effect Impact on Extraction Increases surface area ( ); decreases permeability ( Speeds up diffusion; increases risk of channeling. Grind Size (Coarse) Decreases surface area; increases permeability ( Slows down diffusion; requires longer contact time. Water Temp (High) Increases diffusion coefficient ( ); lowers viscosity ( Accelerates extraction; extracts heavier, bitter compounds. Agitation (Stirring) Introduces mechanical energy; disrupts boundary layers. Artificially increases the concentration gradient ( Summary for PDF Download