Brewing Science

The science connecting dose, water, grind, temperature, time, pressure and extraction.

Extraction and concentration

Extraction describes material moving from ground coffee into brewing water. Concentration describes how much dissolved material is present in the finished beverage. They are related but not identical.

Dose and brew ratio

Changing coffee mass relative to water changes beverage concentration. A ratio is a recipe parameter, not a guarantee of flavour or extraction yield.

Grind and surface area

Finer particles generally provide more surface area and can change extraction speed and flow. A grinder also produces a distribution of particle sizes rather than one perfect particle diameter.

Temperature

Higher water temperature generally increases extraction kinetics, but the useful range depends on coffee, method and recipe.

Time and flow

Longer contact can increase extraction, but flow rate and agitation also matter. Espresso adds pressure, puck structure and flow resistance to the system.

Taste as feedback

Sensory evaluation remains the final practical test. Numbers help control a recipe, but a measured extraction yield does not automatically determine whether a cup tastes good to a particular person.