Measuring the water activity in a cannabis product is an excellent way to test how susceptible the product is to microbial contamination. The higher the measured water activity is in a product, the more freely water can be used by microbes as a food source or to support chemical and enzymatic reactions leading to spoilage.

In other words, the higher the water activity value, the more vulnerable cannabis products are to microorganism growth. Water activity is a thermodynamic measurement that describes how tightly bound the water’s available energy is. The results can range from 0.000, which would be the measurement of a dry sample devoid of water content, to 1.000, which would be the measurement of pure, liquid water.

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