1).Īny pycnometer of equivalent characteristics may be used. This thermometer should be calibrated (Fig. Pyrex-glass pycnometer of around 100 mL capacity with a removable thermometer, with ground-glass joint and 10 th-of-a-degree graduations, from 10 ☌ to 30 ☌. To prepare 1 litre, weigh out 20 g of sodium chloride and dissolve to volume in water.Ĭurrent laboratory apparatus, including the following:Ī.3.1.

Type II water for analytical use (ISO 3696 standard), or of equivalent purity The volumes of the flask and the capillary being known, the density is determined by weighing using precision balances before and after filling of the pycnometer.Ī.2.1. When the flask is closed, the overflow rises in the capillary. This comprises a flask of known capacity, onto which a hollow ground-glass stopper is fitted equipped with a capillary tube. The density of the wine or must is measured for a specific temperature using a glass pycnometer. Method A: Density at 20 ☌ and specific gravity at 20 ☌ measured by pycnometry (Type method) If the wine or must contains notable quantities of carbon dioxide, remove the grand majority by, for example, mixing 250 mL of sample in a 1000-mL vial, or by filtering under reduced pressure on 2 g of cotton placed in an extension tube, or by any other suitable method. Note: For very precise determinations, the density should be corrected to account for sulphur-dioxide action. Method C: Densimetry using a hydrostatic balance Method B: Electronic densimetry using a frequency oscillator The principle of each method is detailed in the following parts: Note: It is possible to obtain the specific gravity from the density ρ 20 at 20 ☌: For the analysis of wine or must, it is typically expressed as the ratio of the density of the wine or must at 20 ☌ to the density of water at 20 ☌. The specific gravity is the ratio of the density of a substance to the density of a reference material. It is expressed in g/cm 3 and its symbol is ρ 20☌. This resolution is applicable for determining the density and specific gravity at 20 ☌ of wines and musts, using any of the following:Įlectronic densimetry using a frequency oscillator: Type I Method,ĭensimetry using a hydrostatic balance: Type I Method,ĭensity is the quotient of the mass of a certain volume of wine or must at 20 ☌ by this volume. OIV-MA-AS2-01 Density and specific gravity at 20☌

Water density at 20 c