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Unit for displaying the Relative Density or the specific weight of Grape Which is the mass (weight) of the must in proportion to its volume. This is also referred to as extract mass consists of the solutes in the grape, where mainly share Sugar (Fructose, glucose). The specific weight of the grape is always greater than 1.0 (water), the difference arises mainly from the sugar content. The difference "of a certain volume of must weight" to the "weight of an equal volume of water" is called weight ratio. Most of the weight, the possible Alcohol content be derived from the wine (theoretical) complete ferme...You see a shortened form of description. The full description is reserved for our subscribers.