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  2. Mathematical coincidence - Wikipedia

    en.wikipedia.org/wiki/Mathematical_coincidence

    A density of one ounce per cubic foot is very close to one kilogram per cubic metre: 1 oz/ft 3 = 1 oz × 0.028349523125 kg/oz / (1 ft × 0.3048 m/ft) 31.0012 kg/m 3. The ratio between one troy ounce and one gram is approximately =.

  3. List of unusual units of measurement - Wikipedia

    en.wikipedia.org/wiki/List_of_unusual_units_of...

    This translates to a hoppus foot being equal to 1.273 cubic feet (2,200 in 3; 0.0360 m 3). The hoppus board foot, when milled, yields about one board foot. The volume yielded by the quarter-girth formula is 78.54% of cubic measure (i.e. 1 ft 3 = 0.7854 h ft; 1 h ft = 1.273 ft 3). [45]

  4. Alcohol measurements - Wikipedia

    en.wikipedia.org/wiki/Alcohol_measurements

    4.8 US fl oz: 5 imp oz: 14 of an Imperial pint. Also called a Quartern or Noggin. [note 1] [1] [2] Nip (UK) 189.42 mL: 6.39 US fl oz: 6.66 imp oz: 13 of an Imperial pint. Short for Nipperkin. Strong ale and Barley wine were usually bottled in nips [3] Metric measurement glasses and containers usually round up to a metric half pint of ...

  5. Dram (unit) - Wikipedia

    en.wikipedia.org/wiki/Dram_(unit)

    The fluid dram (or fluid drachm in British spelling [17]) is defined as 18 of a fluid ounce, [5]: C-5, C-7 and is exactly equal to: 3.696 691 195 3125 ml in the U.S. customary system [5]: C-5, C-12 3.551 632 8125 ml in the British Imperial system [5]: C-7 [18] A teaspoonful has been considered equal to one fluid dram for medical ...

  6. Quart - Wikipedia

    en.wikipedia.org/wiki/Quart

    The reputed quart was a measure equal to two-thirds of an imperial quart (or one-sixth of an imperial gallon), at about 0.7577 liters, which is very close to one US fifth (0.757 liters). The reputed quart was previously recognized as a standard size of wine bottle in the United Kingdom, and is only about 1% larger than the current standard wine ...

  7. Apothecaries' system - Wikipedia

    en.wikipedia.org/wiki/Apothecaries'_system

    Apothecaries' system. German postage stamp from 1991, commemorating 750 years of the apothecary profession. The apothecaries' system, or apothecaries' weights and measures, is a historical system of mass and volume units that were used by physicians and apothecaries for medical prescriptions and also sometimes by scientists. [1][2][3] The ...

  8. Unit fraction - Wikipedia

    en.wikipedia.org/wiki/Unit_fraction

    Slices of approximately 1/8 of a pizza. A unit fraction is a positive fraction with one as its numerator, 1/ n.It is the multiplicative inverse (reciprocal) of the denominator of the fraction, which must be a positive natural number.

  9. Ounce - Wikipedia

    en.wikipedia.org/wiki/Ounce

    The ounce (/ ˈ aʊ n s /) is any of several different units of mass, weight, or volume and is derived almost unchanged from the uncia, an Ancient Roman unit of measurement.. The avoirdupois ounce (exactly 28.349523125 g) is 1 ⁄ 16 avoirdupois pound; this is the United States customary and British imperial ounce.