Input lever
Grind & Particles
Wheel face
Grinder model
The grinder used to prepare the coffee.
AeroPress Wheel Variable
Bed permeability
Grind & Particles · Process state
How easily liquid can move through the grounds.
Process state
Grind & Particles
Wheel face
Technical science
Competition practice
Definition
Permeability is the coffee bed’s openness to liquid flow once the grounds are wetted and compressed into a brewing bed.
Why It Matters
Permeability strongly affects press resistance, clogging, and the viability of slow-flow recipes.
Page Context
Bed permeability is part of the Brew Supply AeroPress Wheel and helps brewers describe how easily liquid can move through the grounds.
Related variables
Input lever
Grind & Particles
Wheel face
Burr set
The burr geometry installed in the grinder.
Input lever
Grind & Particles
Advanced detail
Burr alignment
How evenly the burrs are aligned.
Input lever
Grind & Particles
Wheel face
Grind setting
The selected grind size setting.
Input lever
Grind & Particles
Wheel face
Grind speed / RPM
The speed at which the grinder is operated.
Input lever
Grind & Particles
Wheel face
Sieving
Separating grounds by particle size after grinding.
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.