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What Is Water Activity in Coffee Roasting?

Writer: Kühne Kaffee
Kühne Kaffee
Aug 10
1 min read

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.

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