What does boil gravity mean?

Discussion in 'Beginners Brewing Forum' started by John Quiroga, Jan 24, 2018.

  1. Rat Terrier

    Rat Terrier New Member

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    I am currently reading John Palmer's How to Brew and in the book he has a chapter with a few of his favorite recipes. On each recipe he has the following, "Boil gravity for x gallons" (x being the number of gallons).

    For example on recipe "Confident Bastard - American Strong Ale" Version : Extract and Steeping Grain" he has listed under Wort A, "Boil gravity of 3 gallons" 1.059.

    What does boil gravity of 3 gallons 1.059 mean?
     
  2. Nosybear

    Nosybear Well-Known Member

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    That means the three gallons of wort you are starting your boil with has a specific gravity of 1.059. The wort is more dense than water (specific gravity 1.000), the specific gravity is a measure of how much sugar is in the wort (dissolved solids, actually, because all of them contribute to the density of the wort).
     
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  3. Trialben

    Trialben Well-Known Member

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    Thatd be the same as brewersfriends pre boil gravity.
     
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  4. Chaos home brewing

    Chaos home brewing Active Member

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    It is measured with a hydrometer or refractometer.
     
  5. Trialben

    Trialben Well-Known Member

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    Both or either will suffice.

    I've not got a refractometer but less wort is needed to measure gravity and it's pre fermentation so no alcohol in suspension to scue the reading.
     

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