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Blending by weight allows more flexibility in trial blend volumes and with a good scale it allows finer sensitivity in the amount of each beer added to trial blends. In addition, with the appropriate scale final blending may also be carried out with good precision by weight rather than estimating volumes. Small density differences between beers included in the blend can be ignored because the density range between samples is so small (an FG difference of 1.010 from 1.000 introduces a 1% error). See [https://www.facebook.com/groups/MilkTheFunk/1076426165718930/ Dave Janssen's blending spreadsheet] for a tool that will convert blended weights into volumes if you prefer to do the final blending by volume.
On a homebrew system, using a luggage scale is useful for blending by weight. Blending can be done in a vessel such as a keg. Weigh the empty keg before hand. Each gallon of beer will weigh around 8.3 gallons pounds (3.76 kilograms). Use the luggage scale (or another type of scale) to weigh out how much beer has been added to the vessel.
==Bière de Coupage==