Input lever
Recipe & Mass Balance
Wheel face
Coffee dose
The mass of coffee used in the recipe.
AeroPress Wheel Variable
Retained liquid
Recipe & Mass Balance · Process state
Water trapped in the bed or left in the brewer.
Process state
Recipe & Mass Balance
Wheel face
Measurement-friendly
Technical science
Inferred
Definition
Retained liquid is the portion of brew water that remains with the puck or brewing hardware instead of entering the beverage.
Why It Matters
It changes beverage yield, extraction math, and how comparable two recipes really are.
Page Context
Retained liquid is part of the Brew Supply AeroPress Wheel and helps brewers describe water trapped in the bed or left in the brewer.
Related variables
Input lever
Recipe & Mass Balance
Detail panel
Dose into grinder
The mass of whole-bean coffee placed into the grinder.
Input lever
Recipe & Mass Balance
Detail panel
Dose into brewer
The actual ground coffee mass placed in the AeroPress.
Input lever
Recipe & Mass Balance
Wheel face
Brew water mass
The total water mass that contacts the coffee during extraction.
Input lever
Recipe & Mass Balance
Wheel face
Stage water masses
How brew water is split across recipe phases.
Input lever
Recipe & Mass Balance
Detail panel
Bloom water
The initial water used for wetting and gas release.
Affected outcomes
Measured metric
Cup Outcome
Wheel face
Beverage TDS
Measured total dissolved solids in the served beverage.
Calculated metric
Cup Outcome
Wheel face
Extraction Yield
Calculated percentage of coffee mass extracted.
Measured metric
Cup Outcome
Wheel face
Beverage Yield
The liquid beverage mass collected or served.
Cup outcome
Cup Outcome
Wheel face
Aroma
The smell of the brewed coffee.