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The grain was the legal foundation of traditional English weight systems, [5] and is the only unit that is equal throughout the troy, avoirdupois, and apothecaries' systems of mass. [6]: C-6 The unit was based on the weight of a single grain of barley which was equal to about + 4 ⁄ 3 the weight of a single grain of wheat.
C-19 [17] Thus one troy ounce = 480 grains × 0.064 798 91 grams/grain = 31.103 476 80 grams. Since the ounce avoirdupois is defined as 437.5 grains, a troy ounce is exactly 480 ⁄ 437.5 = 192 ⁄ 175 or about 1.09714 ounces avoirdupois or about 9.7% more. The troy ounce for trading precious metals is considered to be sufficiently approximated ...
The grain is the traditional measurement of the weight of bullets, black powder and smokeless powder in English-speaking countries. It is the unit measured by the scales used in handloading; commonly, bullets are measured in increments of one grain, gunpowder in increments of 0.1 grains. [12] There are 7,000 grains in one pound.
10 −1 g dg decigram 10 1 g dag ... is an SI-compatible unit of mass equal to a ... Historical units include the stone, the pound, the carat, and the grain.
Thickness of leather is measured in ounces, 1 oz equals 1 ⁄ 64 inch (0.40 mm). [30] Bolts and screws follow the Unified Thread Standard rather than the ISO metric screw thread standard. Knitting needles in the United States are measured according to a non-linear unitless numerical system.
The number of grains of wheat on the second half of the chessboard is 2 32 + 2 33 + 2 34 + ... + 2 63, for a total of 2 64 − 2 32 grains. This is equal to the square of the number of grains on the first half of the board, plus itself. The first square of the second half alone contains one more grain than the entire first half.
The barleycorn is an English unit of length [1] equal to 1 ... Older sources claimed the average length of a grain of barley was 0.345 in (8.8 mm), ...
The U.S. perm is defined as 1 grain of water vapor per hour, per square foot, per inch of mercury. 1 U.S. perm = 0.659045 metric perms