Evaporation Loss
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Definition
Amount of wort volume lost due to evaporation during the boil period.
Evaporation Loss = (Evap/Hour / 100 ) * Wort Boil Duration * Kettle Volume
Example
If you have 7% entered in the Evap/Hour field, and you boil 5 gallons of wort for 1.5 hours, then the volume of water lost will be .53 gallons.
Evaporation Loss = .53 = (7 / 100) * 1.5 * 5