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The micrometre (Commonwealth English as used by the International Bureau of Weights and Measures; [1] SI symbol: μm) or micrometer (American English), also commonly known by the non-SI term micron, [2] is a unit of length in the International System of Units (SI) equalling 1 × 10 −6 metre (SI standard prefix "micro-" = 10 −6); that is, one millionth of a metre (or one thousandth of a ...
(also called 1 micron) 1–4 μm ... the length of one side of a square whose area is one barn ... height of Big Ben; 100 meters ...
Size of the primary mirror of the Extremely Large Telescope, the largest optical telescope in the world (under construction) [34] 10 3: 1 kilo square meter k(m 2) 1,000 m 2: Surface area of a modern stremma or dunam: 1,250 m 2: Surface area of the water in an Olympic-size swimming pool [35] 4,047 m 2: 1 acre [36] 5,400 m 2: Size of an American ...
The picometre is one thousand femtometres, one thousandth of a nanometre ( 1 / 1000 nm), one millionth of a micrometre (also known as a micron), one billionth of a millimetre, and one trillionth of a metre. [2] The symbol μμ was once used for it. [3] It is also one hundredth of an ångström, an internationally known (but non-SI) unit ...
Metric units are units based on the metre, gram or second and decimal (power of ten) multiples or sub-multiples of these. According to Schadow and McDonald, [ 1 ] metric units, in general, are those units "defined 'in the spirit' of the metric system, that emerged in late 18th century France and was rapidly adopted by scientists and engineers.
Micro (Greek letter μ, mu, non-italic) is a unit prefix in the metric system denoting a factor of 10 −6 (one millionth). [1] It comes from the Greek word μικρός (mikrós), meaning "small". [2] It is the only SI prefix which uses a character not from the Latin alphabet.
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The microscopic scale (from Ancient Greek μικρός (mikrós) 'small' and σκοπέω (skopéō) 'to look (at); examine, inspect') is the scale of objects and events smaller than those that can easily be seen by the naked eye, requiring a lens or microscope to see them clearly. [1]