The fresh mass (FM) is a unit for agricultural and forestry products. It describes the mass of the weighted yield and is usually given per hectare. It is compared to the dry matter that remains after the raw water has been subtracted ; The dry matter content and water content therefore add up to the fresh matter = 100 percent.
The following formula applies:
This contains the total mass of the sample, the mass of the water, the mass of the dry substance and the mass of the fresh substance. represents the weight fraction of the dry matter, the fraction of the water (water content) and the weight fraction of the fresh matter .