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Length; system unit code (other) symbol or abbrev. notes conversion factor/m combinations SI: gigametre: Gm Gm US spelling: gigameter 1.0 Gm (620,000 mi) megametre: Mm Mm US spelling: megameter
Conversion of the Mach unit of speed depends on the altitude at which the speed is measured. That altitude should be specified either in feet (for example, |altitude_ft=10,000) or in metres (for example, |altitude_m=3,749). The altitude cannot be determined accurately and only a whole number is accepted. Examples:
The value of the United Kingdom primary standard of the yard was determined in terms of the meter by the National Physical Laboratory in 1964 to be 0.914 3969 m, [27] implying a pre-1959 UK foot of 0.304 7990 m. The UK adopted the international yard for all purposes through the Weights and Measures Act 1963, effective January 1, 1964. [28]
square yard yard carré or verge carrée: a superficial area equal to that of a square each side of which measures one yard 8361.2736 cm 2: square foot pied carré: 1 ⁄ 9 sq yd 929.0304 cm 2: square inch pouce carré: 1 ⁄ 144 sq ft 6.4516 cm 2
In practice the "warship fathom" of exactly 6 feet (1.8 m) was used in Britain and the United States. [11] No conflict between the definitions existed in practice, [ citation needed ] since depths on imperial nautical charts were indicated in feet if less than 30 feet (9.1 m) and in fathoms for depths greater than that.
The angle between two successive points of the thirty-two point compass (11 degrees 15 minutes) (rare) [1] Shackle: Length: Before 1949, 12.5 fathoms; later 15 fathoms. [2] Toise: Length: Toise was also used for measures of area and volume Twenty-foot equivalent unit or TEU: Volume: Used in connection with container ships and ports
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The National Institute of Standards and Technology formerly contended that customary area units are defined in terms of the square survey foot, not the square international foot, [17] but from 2023 it states that "although historically defined using the U.S. survey foot, the statute mile can be defined using either definition of the foot, as is ...