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1.75 m – (5 feet 8 inches) – height of average U.S. male human as of 2002 (source: U.S. CDC as per female above) 2.4 m – wingspan of a mute swan; 2.5 m – height of a sunflower; 2.7 m – length of a leatherback sea turtle, the largest living turtle; 2.72 m – (8 feet 11 inches) – tallest-known human (Robert Wadlow) [31]
Under the Harappan linear measures, Indus cities during the Bronze Age used a foot of 13.2 inches (335 mm) and a cubit of 20.8 inches (528 mm). [11] The Egyptian equivalent of the foot—a measure of four palms or 16 digits—was known as the djeser and has been reconstructed as about 30 cm (11.8 in).
The US survey foot is defined so that 1 metre is exactly 39.37 inches, making the international foot of 0.3048 metres exactly two parts per million shorter. This is a difference of just over 3.2 mm, or a little more than one-eighth of an inch per mile.
The imperial system, which is still used for some measures in the United Kingdom and other countries, is based on avoirdupois, with variations from U.S. customary units larger than a pound. The pound avoirdupois, which forms the basis of the U.S. customary system of mass, is defined as exactly 453.59237 grams by agreement between the U.S., the ...
2.426 310 215 (18) × 10 −12 [18] The reduced Compton wavelength of the electron λ C: 3.861 592 6764 (18) × 10 −13 [19] The Compton wavelength (or reduced Compton wavelength) of any fundamental particle λ x: The Bohr radius of the hydrogen atom (Atomic unit of length) a 0: 5.291 772 083 (19) × 10 −11 [18] The reduced wavelength of ...
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Of particular interest was the rood which was 15 North German feet in length, the North German foot being equivalent to 335 mm (13.2 inches). [3]: 50 Craftsmen, on the other hand used a shorter Roman foot. The standard Troy pound, destroyed in a fire in 1834. Standardization of weights and measures was a recurring issue for monarchs.
The toise (fathom) was defined as exactly two metres and was as before divided into 6 pieds (or "feet") or 72 pouces (inches). The pouce was divided into 12 lignes (or "lines"). The pied and pouce , at precisely 333. 3 mm and 27. 7 mm, were about 2.6% larger than the previous Parisian measures and 9% larger than their English counterparts.