Input lever
Brewer & Filter Setup
Wheel face
Upright / inverted orientation
Whether the AeroPress is brewed upright or inverted.
AeroPress Wheel Variable
Air retention
Brewer & Filter Setup · Process state
Air trapped in the brewer after setup.
Process state
Brewer & Filter Setup
Detail panel
Inferred
Competition practice
Definition
Air retention describes how much air remains in the brewer once the setup is complete and pressing begins.
Why It Matters
Retained air changes feel, hiss timing, and liquid displacement.
Page Context
Air retention is part of the Brew Supply AeroPress Wheel and helps brewers describe air trapped in the brewer after setup.
Related variables
Input lever
Brewer & Filter Setup
Detail panel
Chamber fill level
How full the chamber is during brewing.
Input lever
Brewer & Filter Setup
Detail panel
Plunger insertion depth
How far the plunger is inserted before brewing.
Input lever
Brewer & Filter Setup
Wheel face
Air gap
The volume of trapped air in the brewer.
Input lever
Brewer & Filter Setup
Detail panel
Air expulsion
Deliberately pushing out excess air before pressing.
Input lever
Brewer & Filter Setup
Wheel face
Seal quality
How well the plunger and chamber seal together.
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.