/ WORT, BEER AND BEER-BASED BEVERAGES / Beverages in General / Density Measurement/Apparent Specific Gravity (sL20/20)

B-590.08.903 [2020-10] Density – Aræometric Method (Hydrometer)

Definitions: Density – Specific Gravity – Apparent Specific Gravity (SG_A20/20)

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Density: The mass of a substance divided by its volume, unit: g/cm³ or kg/m³.

Density of water at 20 °C: 0.9982071 g/cm³ or 998.2071 kg/m³
Density of dry air at 1013 mbar: 1.2046 kg/m³

Specific Gravity: Density of a substance at 20 °C divided by the density of the same volume of water at 20 °C.

Specific gravity of water at 20 °C: 1.0000
Specific gravity of air at 1013 mbar and 20 °C: 0.001208

Specific gravity does not have a unit.

Apparent specific gravity (SG_A20/20): Apparent density of the sample at 20 °C divided by the apparent density of water at 20 °C. Water possesses an apparent specific gravity of 1.0000 at 20 °C; air does not have an apparent specific gravity (i.e., 0.0000).

The apparent specific gravity does not have a unit.

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Application/Purpose

Determination of the density of a liquid using an aræometer (Archimedes' principle)

Scope of Application

beer, beer-based beverages, NAB, beverages, liquid

Principle

Determining the density by using the buoyancy of a hollow body of constant volume requires an aræometer (hydrometer) with a suitable measurement range. The buoyancy corresponds to the weight of the water displaced by the submerged hollow body and is directly proportional to the density of the displaced fluid.