What Is Water Activity in Coffee Roasting?
Definition
A measure of how available water is for chemical reactions and microbial growth, distinct from total moisture content.
Why it matters
This green-coffee property can change heat demand, roast behavior and the repeatability of a profile.
How it is measured or recognized
Use a documented sampling and instrument method, and record relevant sample temperature and conditioning.
Roasting tip
Compare lots only when the measurement method and sample preparation are consistent.
Related terms
Browse the Coffee Roasting Dictionary A–Z.
Comments