See under Relative density.
This unit of measurement (also specific density) describes the quotient of two densities as a dimensionless ratio. In viticulture, the weight ratio between the volumetric mass of wine or grape must and the same volumetric mass of water (with density 1.000) is determined at a measuring temperature of 20 °Celsius. In the case of grape must, this is also referred to as...
There is a vast number of sources on the web where one can acquire knowledge about wine. But none has the scope, timeliness and accuracy of the information in the encyclopaedia at wein.plus. I use it regularly and rely on it.
Sigi Hiss
freier Autor und Weinberater (Fine, Vinum u.a.), Bad Krozingen