Water Activity & Moisture Content

Water Activity & Moisture Content

Water activity is a measure of the amount of moisture that is present near the surface of a product.  Commonly used in the produce industry, water activity must be below 0.65 for compliance tests for cannabis flower.  Low water activity assures there will be less growth of microbes in the product.  EVIO uses specialized water activity meters, either in the field or in the lab, to perform the test.

Moisture content is a measure of the total amount of moisture in the material.   Moisture content may be measured by using a moisture balance instrument, or through a drying method.  Both methods involve measuring the weight of water loss before and after drying of a sample.