Water Activity

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Cannabis Testing

Water Activity

Water Activity is used to determine the propensity of a product to grow mold or fungus and is measured using a Hygrometer.

Defined as the partial vapor pressure of water in a substance divided by the standard state partial vapor pressure of water. A product with low water activity (i.e. Instant Coffee) will be less susceptible to biological growth, while a product with high water activity (i.e. Fresh Meat/Fish) will be more susceptible to biological growth. Water activity is not the same as its moisture content, although products with higher moisture content will typically have higher water activity.

Water Activity

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