
Water Activity in Specialty Green Coffee: A Long Term Observational Study by Ian Fretheim
We know that water is wet, but that fact alone isn’t enough to capture water’s immense power. That power is evident in coffee, not simply in the cup but also in the seeds themselves: Water activity (Aw) is the relative equilibrium that exists (or doesn’t exist) between the vapor pressure inside a food or a coffee seed as compared with the surrounding humidity or environment. In perishable foods, it is a significant measure for the sake of safety and the prevention of food-borne illness, but in coffee, it’s a significant measure…why, exactly? Click to find out.
















