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Unit of measurement for representing the relative density or the specific gravity of grape, that is the mass (weight) in relation to the volume. This mass, also referred to as extract, consists of the solutes in the grape must. That's mainly sugar (Fructose, glucose), as well acids, Minerals, phenolic Links, proteins and others (these substances are then found partly in the total extract the wine again). The specific gravity of grape must is always greater than 1.0 (water), the difference is largely due to the sugar content, The difference "weight of a certain volume of a must" to "weight of the same volume of water" is called weight ratio.

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