Defined as 100 × (OE − RE) / OE. With Balling's real-extract relation this
reduces to 0.8192 × ADF, which is where the "RDF is about 80 % of apparent
attenuation" rule of thumb comes from.
ASBC's laboratory RDF has an extra correction for the mass of CO₂ that left
the beer. The difference is a few tenths of a percent and we don't model it.
Real degree of fermentation, in %.
Defined as
100 × (OE − RE) / OE. With Balling's real-extract relation this reduces to0.8192 × ADF, which is where the "RDF is about 80 % of apparent attenuation" rule of thumb comes from.ASBC's laboratory RDF has an extra correction for the mass of CO₂ that left the beer. The difference is a few tenths of a percent and we don't model it.