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Gravity (alcoholic beverage)

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2743: 2729: 373:, yeast converts sugars into carbon dioxide and alcohol. By monitoring the decline in SG over time the brewer obtains information about the health and progress of the fermentation and determines that it is complete when gravity stops declining. If the fermentation is finished, the specific gravity is called the final gravity (abbreviated FG). For example, for a typical strength beer, original gravity (abbreviated OG) could be 1.050 and FG could be 1.010. 309: 413: 77: 234: 36: 2757: 179: 488:
usually 20 °C (68 °F) for both sample and water but in some parts of the world different temperatures may be used and there are hydrometers sold calibrated to, for example, 16 °C (60 °F). It is important, where any conversion to °P is involved, that the proper pair of temperatures be used for the conversion table or formula being employed. The current
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With typical values of 1.050 and 1.010 for, respectively, OG and FG this simplified formula gives an ABV of 5.31% as opposed to 5.23% for the more accurate formula. Formulas for alcohol similar to this last simple one abound in the brewing literature and are very popular among home brewers. Formulas
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Points can be used in the ADF and RDF formulas. Thus a beer with OG 1.050 which fermented to 1.010 would be said to have attenuated 100 × (50 − 10)/50 = 80%. Points can also be used in the SG versions of the alcohol formulas. It is simply necessary to multiply by 1000 as points are 1000 times (SG −
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quantitative analysis but can also be done by evaporation in a water bath. If the residue is made back up to the original volume of beer which was subject to the evaporation process, the specific gravity of that reconstituted beer measured and converted to Plato using the tables and formulas in the
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Specific gravity is the ratio of the density of a sample (of any substance) to the density of water. The ratio depends on the temperature and pressure of both the sample and water. The pressure is always considered (in brewing) to be 1 standard atmosphere (1,013.25 hPa) and the temperature is
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This formula is fine for those who wish to go to the trouble to compute TE (whose real value lies in determining attenuation) which is only a small fraction of brewers. Others want a simpler, quicker route to determining alcoholic strength. This lies in Tabarie's Principle which states that the
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The difference between the original gravity of the wort and the final gravity of the beer is an indication of how much sugar has been turned into alcohol. The bigger the difference, the greater the amount of alcohol present and hence the stronger the beer. This is why strong beers are sometimes
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The amount of extract which was not converted to yeast biomass, carbon dioxide or ethanol can be estimated by removing the alcohol from beer which has been degassed and clarified by filtration or other means. This is often done as part of a distillation in which the alcohol is collected for
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Knowing the amount of extract in 100 grams (3.5 oz) of wort before fermentation and the number of grams of extract in 100 grams (3.5 oz) of beer at its completion, the amount alcohol (in grams) formed during the fermentation can be determined. The formula follows, attributed to
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depression of specific gravity in beer to which ethanol is added is the same as the depression of water to which an equal amount of alcohol (on a w/w basis) has been added. Use of Tabarie's principle lets us calculate the true extract of a beer with apparent extract
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By considering the original gravity, the brewer or vintner obtains an indication as to the probable ultimate alcoholic content of their product. The OE (Original Extract) is often referred to as the "size" of the beer and is, in Europe, often printed on the label as
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However, the above approximation has increasingly larger error for increasing values of specific gravity and deviates e.g. by 0.67°P when SG = 1.080. A much more accurate (mean average error less than 0.02°P) conversion can be made using the following formula:
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such as this one make it possible to mark hydrometers with "potential alcohol" scales based on the assumption that the FG will be close to 1 which is more likely to be the case in wine making than in brewing and it is to vintners that these are usually sold.
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referred to as high gravity beers, and "session" or "small" beers are called low gravity beers, even though in theory the final gravity of a strong beer might be lower than that of a session beer because of the greater amount of alcohol present.
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table is (20 °C/20 °C) meaning that the density is measured at 20 °C (68 °F) and referenced to the density of water at 20 °C (68 °F) (i.e. 0.998203 g/cm or 0.0360624 lb/cu in). Mathematically
550: 1353: 2225: 559:) measure density directly and so must use a hydrometer, whose stem is bathed in air, or pycnometer weighings which are also done in air. Hydrometer readings and the ratio of pycnometer weights are influenced by air (see article 2575: 569: 2413:
The relationship between SG and °P can be roughly approximated using the rule-of-thumb conversion equation "brewer's points divided by four", where the "Brewing" or "Gravity points" are the thousandths of SG above 1:
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The original gravity is the specific gravity measured before fermentation. From it the analyst can compute the original extract which is the mass (grams) of sugar in 100 grams (3.5 oz) of wort (°P) by use of the
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Because ABV depends on multiplicative factors (one of which depends on the original extract and one on the final) as well as the difference between OE and AE it is impossible to come up with a formula of the form
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As an example, a wort of SG 1.050 would be said to have 1000(1.050 − 1) = 50 points, and contain 50/4 = 12.5 °P of extract. This is simply the linear approximation to the true relationship between SG and °P.
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or sometimes just as a percent. In the Czech Republic, for example, common descriptions are "10 degree beers", "12 degree beers" which refers to the gravity in Plato of the wort before the fermentation.
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tools are available to brewers to convert between the various units of measurement and to adjust mash ingredients and schedules to meet target values. The resulting data can be exchanged via
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Most brewers and consumers are used to having alcohol content reported by volume (ABV) rather than weight. Interconversion is simple but the specific gravity of the beer must be known:
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article. The use of "apparent" here is not to be confused with the use of that term to describe specific gravity readings which have not been corrected for the effects of air.
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The drop in extract during the fermentation divided by the OE represents the percentage of sugar which has been consumed. The real degree of attenuation (RDF) is based on TE
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gives the number of grams of alcohol per 100 grams (3.5 oz) of beer i.e. the ABW. Note that the alcohol content depends not only on the diminution of extract
499: 1253: 2147: 1960: 1376: 1245: 831: 723: 695: 654:{\displaystyle {\text{SG}}_{\text{true}}={\text{SG}}_{\text{apparent}}-{\rho _{\text{air}} \over \rho _{\text{water}}}({\text{SG}}_{\text{apparent}}-1)} 2478: 197: 664:
However, the ASBC table uses apparent specific gravities, so many electronic density meters will produce the correct °P numbers automatically.
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Several different scales have been used for measuring the original gravity. For historical reasons, the brewing industry largely uses the
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Because of the near linear relationship between (SG − 1) and °P specific gravities can be used in the ADF formula as shown.
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The final gravity is the specific gravity measured at the completion of fermentation. The apparent extract, denoted
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for details) and are called "apparent" readings. True readings are easily obtained from apparent readings by
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by weight at 20 °C. Inserting this into the alcohol formula the result, after rearrangement, is
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This formula gives the true specific gravity i.e. based on densities. Brewers cannot (unless using a
1893: 423: 2097:{\displaystyle A_{v}=250f_{pm}({\text{OG}}-{\text{FG}}){{\text{SG}}_{\text{beer}} \over 0.79661}} 427: 255: 87: 2472:
The amount of extract in degrees Plato are thus approximately given by the points divided by 4:
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is a simple constant. Because of the near linear relationship between extract and (SG − 1) (see
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This is the number of cubic centimetres of ethanol in 100 cc (6 cu in) of beer.
1216:{\displaystyle f_{pn}={1 \over (2.0665-1.0665p/100)}\approx 0.48394+0.0024688p+0.00001561p^{2}} 327: 799:{\displaystyle n=P_{\text{recon}}{{\text{SG}}_{\text{recon}} \over {\text{SG}}_{\text{beer}}}} 2110: 1689:
as a function of OE and AE. It is again possible to come up with a relationship of the form
1385: 1094: 1064: 545:{\displaystyle {\text{SG}}_{\text{true}}={\rho _{\text{sample}} \over \rho _{\text{water}}}} 369:
The density of a wort is largely dependent on the sugar content of the wort. During alcohol
1665: 1462: 1348:{\displaystyle n=P(P^{-1}(m)+1-{\frac {\rho _{\text{EtOH}}(A_{w})}{\rho _{\text{water}}}})} 1032: 370: 2220:{\displaystyle A_{v}=132.715({\text{OG}}-{\text{FG}})=({\text{OG}}-{\text{FG}})/0.00753\,} 8: 2843: 1945: 1361: 1230: 816: 708: 680: 556: 363: 331: 2848: 2141:°P which is 0.4187, and 1.010 can be taken as a typical FG then this simplifies to 1963: 560: 335: 384:
scale used by the wine industry. For example, OG 1.050 is roughly equivalent to 12
2648:= 20 °C. The equivalent relation giving SG at 20 °C for a given °P is: 2799:. Vol. 2. Translated by Kathleen Barton-Wright. London: Chapman & Hall. 2570:{\displaystyle ^{\circ }P\approx p_{t}/4=1000({\text{SG}}-1)/4=250\cdot SG-250.} 843: 2837: 2762: 2742: 355: 2728: 725:, is the °P obtained by inserting the FG into the formulas or tables in the 2770: 2748: 2734: 1413: 1379: 810: 739: 726: 674: 377: 313: 359: 351: 308: 1873:{\displaystyle A_{v}=A_{w}{{\text{SG}}_{\text{beer}} \over 0.79661}} 951:{\displaystyle A_{w}={(p-n) \over (2.0665-1.0665p/100)}=f_{pn}(p-n)} 412: 262:. Statements consisting only of original research should be removed. 76: 2710: 346:
at various stages in the fermentation. The concept is used in the
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where the specific gravity is to be measured at a temperature of
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which depends on the OE. De Clerck tabulated Ballings values for
347: 2756: 338:(abbreviated SG), or relative density compared to water, of the 667: 350:
and wine-making industries. Specific gravity is measured by a
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and the apparent degree of fermentation (ADF) is based on AE
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is the density of an aqueous ethanol solution of strength
1808:{\displaystyle f_{pm}=0.39661+0.001709p+0.000010788p^{2}} 2811: 2717:
to other brewers to facilitate accurate replication.
2657: 2594: 2481: 2423: 2306: 2248: 2150: 2113: 2026: 1972: 1948: 1896: 1827: 1760: 1698: 1668: 1495: 1465: 1422: 1388: 1364: 1256: 1233: 1130: 1097: 1067: 1035: 1022:{\displaystyle f_{pn}={1 \over (2.0665-1.0665p/100)}} 967: 854: 819: 751: 711: 683: 572: 502: 2724: 2695:{\displaystyle SG={\frac {260.4}{260.4-^{\circ }P}}} 2634:{\displaystyle ^{\circ }P=260.4-{\frac {260.4}{SG}}} 188:
may be too technical for most readers to understand
101:. Unsourced material may be challenged and removed. 2694: 2633: 2569: 2460: 2394: 2286: 2219: 2129: 2096: 2009: 1954: 1931: 1872: 1807: 1743: 1681: 1651: 1478: 1451: 1404: 1370: 1347: 1239: 1215: 1113: 1083: 1053: 1021: 950: 825: 798: 717: 689: 653: 544: 813:article for details. TE is denoted by the symbol 2835: 2287:{\displaystyle {\text{RDF}}=100{(p-n) \over p}} 2790: 2788: 2786: 2010:{\displaystyle p\approx 1000({\text{SG}}-1)/4} 1662:Which can be solved, albeit iteratively, for 697:will denote OE in the formulas which follow. 402: 2461:{\displaystyle p_{t}:=1000({\text{SG}}-1)\,} 668:Original gravity (OG); original extract (OE) 393: 2783: 477: 441:. Unsourced material may be challenged and 380:(°P), which is essentially the same as the 64:Learn how and when to remove these messages 1452:{\displaystyle \rho _{\text{EtOH}}(A_{w})} 1378:is a function that converts SG to °P (see 2794: 2457: 2216: 1928: 1740: 1121:but they can be calculated simply from p 701:Final gravity (FG); apparent extract (AE) 461:Learn how and when to remove this message 296:Learn how and when to remove this message 278:Learn how and when to remove this message 216:Learn how and when to remove this message 200:, without removing the technical details. 161:Learn how and when to remove this message 307: 14: 2836: 1061:but also on the multiplicative factor 198:make it understandable to non-experts 2803: 732: 439:adding citations to reliable sources 406: 227: 172: 99:adding citations to reliable sources 70: 29: 1754:De Clerk also tabulates values for 1744:{\displaystyle A_{w}=f_{pm}(p-m)\,} 482: 24: 2408: 836: 316:in use to test the temperature of 25: 2860: 110:"Gravity" alcoholic beverage 45:This article has multiple issues. 2809: 2755: 2741: 2727: 411: 232: 177: 75: 34: 86:needs additional citations for 53:or discuss these issues on the 2535: 2521: 2454: 2440: 2386: 2372: 2367: 2351: 2333: 2321: 2275: 2263: 2234: 2205: 2189: 2183: 2167: 2072: 2056: 2017:the ABV formula is written as 1996: 1982: 1932:{\displaystyle A_{v}=k(p-m)\,} 1925: 1913: 1737: 1725: 1624: 1601: 1574: 1561: 1536: 1530: 1446: 1433: 1342: 1326: 1313: 1288: 1282: 1266: 1176: 1153: 1048: 1036: 1013: 990: 945: 933: 911: 888: 883: 871: 648: 627: 13: 1: 2776: 2107:If the value given above for 7: 2720: 258:the claims made and adding 10: 2865: 2137:corresponds to an OE of 12 403:Low vs. high gravity beers 2818:. Center for Open Science 2795:De Clerck, Jean (1958). 1966:) in particular because 478:Terms related to gravity 742:article then the TE is 2696: 2635: 2571: 2462: 2396: 2288: 2221: 2131: 2130:{\displaystyle f_{pm}} 2098: 2011: 1956: 1933: 1874: 1809: 1745: 1683: 1653: 1480: 1453: 1406: 1405:{\displaystyle P^{-1}} 1372: 1349: 1241: 1217: 1115: 1114:{\displaystyle f_{pn}} 1085: 1084:{\displaystyle f_{pn}} 1055: 1023: 952: 827: 800: 719: 691: 655: 546: 394: 320: 2797:A Textbook of Brewing 2697: 2636: 2572: 2463: 2397: 2289: 2222: 2132: 2099: 2012: 1957: 1934: 1875: 1810: 1746: 1684: 1682:{\displaystyle A_{w}} 1654: 1481: 1479:{\displaystyle A_{w}} 1454: 1407: 1373: 1350: 1242: 1218: 1116: 1086: 1056: 1054:{\displaystyle (p-n)} 1024: 953: 828: 801: 720: 692: 656: 547: 311: 2655: 2592: 2479: 2421: 2304: 2246: 2148: 2111: 2024: 1970: 1946: 1894: 1825: 1758: 1696: 1666: 1493: 1463: 1420: 1386: 1362: 1254: 1231: 1128: 1095: 1065: 1033: 965: 852: 817: 749: 709: 681: 570: 500: 435:improve this section 95:improve this article 366:electronic meter. 332:alcoholic beverages 2692: 2631: 2567: 2458: 2392: 2284: 2217: 2127: 2094: 2007: 1952: 1929: 1870: 1805: 1741: 1679: 1649: 1476: 1449: 1416:) its inverse and 1402: 1368: 1345: 1237: 1213: 1111: 1081: 1051: 1019: 948: 823: 796: 715: 687: 651: 542: 364:oscillating U-tube 321: 243:possibly contains 2690: 2629: 2527: 2446: 2390: 2378: 2365: 2357: 2340: 2310: 2282: 2252: 2203: 2195: 2181: 2173: 2092: 2086: 2081: 2070: 2062: 1988: 1955:{\displaystyle k} 1868: 1862: 1857: 1628: 1588: 1585: 1558: 1430: 1371:{\displaystyle P} 1340: 1337: 1310: 1240:{\displaystyle m} 1180: 1017: 915: 826:{\displaystyle n} 794: 791: 786: 779: 774: 765: 733:True extract (TE) 718:{\displaystyle m} 690:{\displaystyle p} 639: 634: 625: 622: 612: 597: 592: 582: 577: 540: 537: 527: 512: 507: 471: 470: 463: 306: 305: 298: 288: 287: 280: 245:original research 226: 225: 218: 171: 170: 163: 145: 68: 27:Density of a brew 16:(Redirected from 2856: 2828: 2827: 2825: 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The symbol 676: 665: 645: 642: 616: 606: 600: 585: 566: 565: 564: 562: 558: 531: 521: 515: 496: 495: 494: 491: 475: 465: 462: 454: 444: 440: 436: 430: 429: 425: 420:This section 418: 414: 409: 408: 400: 396: 389: 383: 379: 374: 372: 367: 365: 361: 357: 356:refractometer 353: 349: 345: 341: 337: 333: 329: 325: 319: 315: 310: 300: 297: 282: 279: 271: 261: 257: 253: 247: 246: 241:This article 239: 230: 229: 220: 217: 209: 199: 195: 189: 186:This article 184: 175: 174: 165: 162: 154: 151:December 2008 143: 140: 136: 133: 129: 126: 122: 119: 115: 112: –  111: 107: 106:Find sources: 100: 96: 90: 89: 84:This article 82: 78: 73: 72: 67: 65: 58: 57: 52: 51: 46: 41: 32: 31: 19: 18:Final gravity 2820:. Retrieved 2815: 2810:Buhl, Josh. 2805: 2796: 2709: 2704: 2645: 2643: 2583: 2579: 2471: 2412: 2404: 2296: 2238: 2229: 2106: 1941: 1885: 1882: 1817: 1753: 1661: 1357: 1225: 960: 840: 808: 736: 704: 671: 663: 557:U-tube meter 554: 486: 472: 457: 448: 433:Please help 421: 390: 375: 371:fermentation 368: 323: 322: 292: 274: 265: 242: 212: 206:October 2009 203: 187: 157: 148: 138: 131: 124: 117: 105: 93:Please help 88:verification 85: 61: 54: 48: 47:Please help 44: 2771:Plato scale 2749:Wine portal 2735:Beer portal 2235:Attenuation 1793:0.000010788 727:Plato scale 675:Plato scale 378:Plato scale 314:thermometer 2838:Categories 2822:12 October 2777:References 1201:0.00001561 395:Stammwürze 360:pycnometer 352:hydrometer 252:improve it 121:newspapers 50:improve it 2844:Equations 2682:∘ 2678:− 2614:− 2600:∘ 2562:− 2553:⋅ 2530:− 2495:≈ 2487:∘ 2449:− 2381:− 2360:− 2343:≈ 2328:− 2270:− 2198:− 2176:− 2065:− 1991:− 1977:≈ 1920:− 1732:− 1631:− 1608:− 1580:ρ 1553:ρ 1546:− 1523:− 1507:− 1425:ρ 1395:− 1332:ρ 1305:ρ 1298:− 1275:− 1192:0.0024688 1183:≈ 1160:− 1043:− 997:− 940:− 895:− 878:− 643:− 617:ρ 607:ρ 601:− 532:ρ 522:ρ 422:does not 326:, in the 256:verifying 56:talk page 2721:See also 2711:Software 1784:0.001709 809:See the 638:apparent 596:apparent 451:May 2023 2849:Brewing 2715:BeerXML 2214:0.00753 2165:132.715 2090:0.79661 1866:0.79661 1778:0.39661 1186:0.48394 844:Balling 443:removed 428:sources 348:brewing 328:context 324:Gravity 250:Please 192:Please 135:scholar 2139:  1942:where 1611:1.0665 1605:2.0665 1382:) and 1358:where 1163:1.0665 1157:2.0665 1000:1.0665 994:2.0665 961:where 898:1.0665 892:2.0665 526:sample 386:  137:  130:  123:  116:  108:  2674:260.4 2670:260.4 2619:260.4 2611:260.4 1584:water 1414:Plato 1412:(see 1380:Plato 1336:water 811:Plato 778:recon 764:recon 740:Plato 621:water 536:water 142:JSTOR 128:books 2824:2023 2707:1). 2565:250. 2519:1000 2438:1000 2085:beer 1980:1000 1861:beer 1557:EtOH 1429:EtOH 1309:EtOH 790:beer 581:true 511:true 490:ASBC 426:any 424:cite 388:°P. 382:Brix 344:must 340:wort 318:beer 114:news 2550:250 2346:100 2316:100 2309:ADF 2258:100 2251:RDF 2041:250 1622:100 1247:as 1174:100 1011:100 909:100 611:air 437:by 362:or 342:or 254:by 196:to 97:by 2840:: 2814:. 2785:^ 2526:SG 2445:SG 2435::= 2377:OG 2364:FG 2356:OG 2202:FG 2194:OG 2180:FG 2172:OG 2080:SG 2069:FG 2061:OG 1987:SG 1856:SG 1815:. 785:SG 773:SG 633:SG 591:SG 576:SG 506:SG 358:, 354:, 312:A 59:. 2826:. 2687:P 2665:= 2662:G 2659:S 2646:T 2626:G 2623:S 2608:= 2605:P 2559:G 2556:S 2547:= 2544:4 2540:/ 2536:) 2533:1 2522:( 2516:= 2513:4 2509:/ 2503:t 2499:p 2492:P 2468:, 2455:) 2452:1 2441:( 2430:t 2426:p 2387:) 2384:1 2373:( 2368:) 2352:( 2338:p 2334:) 2331:m 2325:p 2322:( 2313:= 2280:p 2276:) 2273:n 2267:p 2264:( 2255:= 2210:/ 2206:) 2190:( 2187:= 2184:) 2168:( 2162:= 2157:v 2153:A 2123:m 2120:p 2116:f 2073:) 2057:( 2052:m 2049:p 2045:f 2038:= 2033:v 2029:A 2005:4 2001:/ 1997:) 1994:1 1983:( 1974:p 1950:k 1926:) 1923:m 1917:p 1914:( 1911:k 1908:= 1903:v 1899:A 1847:w 1843:A 1839:= 1834:v 1830:A 1801:2 1797:p 1790:+ 1787:p 1781:+ 1775:= 1770:m 1767:p 1763:f 1738:) 1735:m 1729:p 1726:( 1721:m 1718:p 1714:f 1710:= 1705:w 1701:A 1675:w 1671:A 1647:0 1644:= 1639:w 1635:A 1625:) 1618:/ 1614:p 1602:( 1597:] 1592:) 1575:) 1570:w 1566:A 1562:( 1543:1 1540:+ 1537:) 1534:m 1531:( 1526:1 1519:P 1514:( 1510:P 1504:p 1500:[ 1472:w 1468:A 1447:) 1442:w 1438:A 1434:( 1398:1 1391:P 1366:P 1343:) 1327:) 1322:w 1318:A 1314:( 1295:1 1292:+ 1289:) 1286:m 1283:( 1278:1 1271:P 1267:( 1264:P 1261:= 1258:n 1235:m 1209:2 1205:p 1198:+ 1195:p 1189:+ 1177:) 1170:/ 1166:p 1154:( 1150:1 1145:= 1140:n 1137:p 1133:f 1107:n 1104:p 1100:f 1077:n 1074:p 1070:f 1049:) 1046:n 1040:p 1037:( 1014:) 1007:/ 1003:p 991:( 987:1 982:= 977:n 974:p 970:f 946:) 943:n 937:p 934:( 929:n 926:p 922:f 918:= 912:) 905:/ 901:p 889:( 884:) 881:n 875:p 872:( 866:= 861:w 857:A 821:n 760:P 756:= 753:n 713:m 685:p 649:) 646:1 628:( 586:= 516:= 464:) 458:( 453:) 449:( 445:. 431:. 299:) 293:( 281:) 275:( 270:) 266:( 248:. 219:) 213:( 208:) 204:( 190:. 164:) 158:( 153:) 149:( 139:· 132:· 125:· 118:· 91:. 66:) 62:( 20:)

Index

Final gravity
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verification
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"Gravity" alcoholic beverage
news
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books
scholar
JSTOR
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original research
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verifying
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thermometer
beer
context
alcoholic beverages
specific gravity

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