Density of water at the gravity reference temperature, kg/L.
Specific gravity is a ratio, so turning it into a density needs the density
of the reference water: water at 20 °C, the 20/20 °C basis we assume for
gravity readings here, and also REFERENCE_VOLUME_TEMP_C. 0.99823 kg/L
is the conventional brewing figure. waterDensityKgPerM3 returns
998.204 kg/m³ at the same temperature, a difference of 26 ppm, which is
three orders of magnitude below the resolution of any scale a keg will sit
on.
Density of water at the gravity reference temperature, kg/L.
Specific gravity is a ratio, so turning it into a density needs the density of the reference water: water at 20 °C, the 20/20 °C basis we assume for gravity readings here, and also REFERENCE_VOLUME_TEMP_C. 0.99823 kg/L is the conventional brewing figure. waterDensityKgPerM3 returns 998.204 kg/m³ at the same temperature, a difference of 26 ppm, which is three orders of magnitude below the resolution of any scale a keg will sit on.