# Jim at RVS

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1. ## Specific Gravity from Table 4

meerkat, Thanks for the answer. It does make perfect sense. You're right...very small worms indeed, but the engineer in me needed to understand. I'll use the handy dandy SG table with your .9990 gm/ml mass density as a base. Again, thanks.
2. ## Specific Gravity from Table 4

I've been investigating the best way to assure proper bottle fill and have been convinced from what I have read here in the forum to fill by weight. That means, of course, knowing what 750 ml of spirit should weigh in the bottle, leading me to research a good density or specific gravity by %ABV chart. There is one I have seen from several sources that shows SG at every %ABV at 60 degrees F, with some sources including a 3 step temperature adjustment table. I then had the bright idea to use TTB Table 4 a a base, converting the "Wine gallons per pound" on the table to grams per milliliter using the conversions of gallons to milliliters and pounds to grams. I assumed the outcomes would be the same but they are not. For 40% ABV, the handy chart gives an SG (which by definition is grams per ml) of 0.9518. Converting Table 4 for 80 proof gave: 1/ (0.12616 *3785.41 ml/gal / 453.592 gm/lb)=0.9498. OK, the difference is 0.2% but I would have though density is density. Any wisdom on a) Where I went wrong on the assumptions or calculations, b) Does it matter given the pretty loose tolerances for fill, and c) What source is commonly used?
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