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The system was originally based on the ale gallon of 282 cubic inches (4.62 L; 1.22 US gal). In United Kingdom and its colonies, with the adoption of the imperial system in 1824, the units were redefined in terms of the slightly smaller imperial gallon (1.2 US gal; 4.5 L).
imp gal atm ≡ 1 atm × 1 gal (imp) = 460.632 569 25 J: gallon-atmosphere (US) US gal atm ≡ 1 atm × 1 gal (US) = 383.556 849 0138 J: hartree, atomic unit of energy: E h: ≡ m e ⋅α 2 ⋅c 2 (= 2 Ry) ≈ 4.359 744 × 10 −18 J: horsepower-hour: hp⋅h ≡ 1 hp × 1 h = 2.684 519 537 696 172 792 × 10 6 J: inch-pound force: in lbf ≡ g 0 ...
The British imperial gallon (frequently called simply "gallon") is defined as exactly 4.54609 dm 3 (4.54609 litres). [4] It is used in some Commonwealth countries, and until 1976 was defined as the volume of water at 62 °F (16.67 °C) [ 5 ] [ 6 ] whose mass is 10 pounds (4.5359237 kg).
The term carboy itself usually refers to a 5 US gal (19 L) carboy, unless otherwise noted. A 1 imp gal (4.5 L) carboy is sometimes called a jug. A 15 US gal (57 L) carboy is usually called a demijohn (in the Philippines, dama juana [10]). In Britain, "demijohn" refers to a 1-imperial-gallon (4.5 L) glass brewing vessel.
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c. 24 (I) — Irish Act about grain measures decreed: unit of measure to be Henry VIII's gallon as confirmed by Elizabeth I; i.e. 272 + 1 ⁄ 4 cubic inches; standard measures of the barrel (32 gallons), half-barrel (16 gallons), bushel (8), peck (2), and gallon lodged in the Irish Exchequer; and copies were provided in every county, city, town ...
The American Twelfth (10 2 ⁄ 3 US oz [315 mL], or 1 ⁄ 12 of a US gallon), American Commercial Pint (12.8 US fl oz [379 mL], or 1 ⁄ 10 of a US gallon) / British Reputed Pint (13 1 ⁄ 3 imp oz [379 mL], or 1 ⁄ 12 an Imperial gallon), and the Canadian "stubby" bottle (12 imp oz [341 mL]) may have been factors.
The formula also includes a "fuel content factor" of 1 / 0.15 (about 6.667) to benefit electric vehicles, raising the value from 12,307 to 82,049 Wh/gal. This reward factor is intended provide an incentive for vehicle manufactures to produce and sell electric vehicles, as a higher equivalent fuel economy for EVs improves the carmaker ...