Theory 115/Coffee extraction/Rate lens
Extraction Follows Flow
The claim
Coffee extraction rate is set by the flow rate through the bed rather than by contact time, so a fast shot can extract more than a slow one.
01Mechanism
Soluble material is removed as water passes; flux determines how much is stripped per unit time.
02Prediction
Extraction should track flow.
03Refutation
Extraction tracking time would remove flux.