Rhode Island General Laws Title 47. Weights and Measures § 47-15-9. Solids and fluids--Trade custom

The statement designating the quantity of the commodity shall be expressed in the terms of weight, measure, numerical count, or combination of numerical count and weight or measure, which are generally used by consumers to express quantity of the commodity and shall give accurate information as to the quantity thereof. If no general consumer usage exists which expresses accurate information as to the quantity of the commodity, the statement shall be in terms of liquid measure if the commodity is liquid, or in terms of weight if the commodity is solid. The quantity of viscous or semisolid commodities, or of a mixture of solids and liquids, may be stated in terms of weight or measure or both. When commodities are packed in brine or other nonedible preserving fluids, the weight or measure of the brine or nonedible fluid shall not be included in the weight or measure of the edible or other commodity indicated on the container. The content declaration for commodities packed in aerosol type containers shall be in terms of net weight.