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The duodecimal system, also known as base twelve or dozenal, is a positional numeral system using twelve as its base.In duodecimal, the number twelve is denoted "10", meaning 1 twelve and 0 units; in the decimal system, this number is instead written as "12" meaning 1 ten and 2 units, and the string "10" means ten.
A significant characteristic of the metric system is its use of decimal multiples – powers of 10. For example, a length that is significantly longer or shorter than 1 metre can be represented in units that are a power of 10 or 1000 metres. This differs from many older systems in which the ratio of different units varied.
The picometre (SI symbol: pm) is a unit of length in the metric system equal to 10 −12 metres ( 1 / 1 000 000 000 000 m = 0. 000 000 000 001 m). To help compare different orders of magnitude this section lists lengths between 10 −12 and 10 −11 m (1 pm and 10 pm).
The Romans used a duodecimal rather than a decimal system for fractions, as the divisibility of twelve (12 = 2 2 × 3) makes it easier to handle the common fractions of 1 ⁄ 3 and 1 ⁄ 4 than does a system based on ten (10 = 2 × 5).
However, when it is inconvenient to use base-60 for minutes and seconds, positions are frequently expressed as decimal fractional degrees to an equal amount of precision. Degrees given to three decimal places ( 1 / 1000 of a degree) have about 1 / 4 the precision of degrees-minutes-seconds ( 1 / 3600 of a degree) and ...
Metric (SI) measurements generally use decimals, not fractions (5.25 mm, not 5 1 ⁄ 4 mm). Non-metric (imperial and US customary) measurements may use fractions or decimals (5 1 ⁄ 4 inches; 5.25 inches); the practice of reliable sources should be followed, and within-article consistency is desirable.
The 50‰ grade is equivalent to 50 ... It is sometimes written as mm/m or m/km instead of the ‰ symbol. [1] [2] ... 7.12° 12.5%: 125‰ 1 in 8 ...
σ x should usually be quoted to only one or two significant figures, as more precision is unlikely to be reliable or meaningful: 1.79 ± 0.06 (correct), 1.79 ± 0.96 (correct), 1.79 ± 1.96 (incorrect). The digit positions of the last significant figures in x best and σ x are the same, otherwise the consistency is lost. For example, "1.79 ± ...