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The femtometre (American spelling femtometer), symbol fm, [1] [2] (derived from the Danish and Norwegian word femten 'fifteen', Ancient Greek: μέτρον, romanized: metron, lit. 'unit of measurement') is a unit of length in the International System of Units (SI) equal to 10 −15 metres , which means a quadrillionth of one metre.
A blue whale has been measured as 33 m (108 ft) long; this drawing compares its length to that of a human diver and a dolphin. The decametre (SI symbol: dam) is a unit of length in the metric system equal to 10 meters (10 1 m). To help compare different orders of magnitude, this section lists lengths between 10 and 100 meters.
Archaeologists consider that this 51.85 centimetres long unit was the origin of the Roman foot. Indeed, the Egyptians divided the Sumerian cubit into 28 fingers and 16 of these fingers gave a Roman foot of 29.633 cm. [8] [6]
Pelvimetry is the measurement of the female pelvis. [1] It can theoretically identify cephalo-pelvic disproportion, which is when the capacity of the pelvis is inadequate to allow the fetus to negotiate the birth canal.
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The use of prefixes can be traced back to the introduction of the metric system in the 1790s, long before the 1960 introduction of the SI. [citation needed] The prefixes, including those introduced after 1960, are used with any metric unit, whether officially included in the SI or not (e.g., millidyne and milligauss). Metric prefixes may also ...
Femtotechnology is a term used in reference to the hypothetical manipulation of matter on the scale of a femtometer, or 10 −15 m. This is three orders of magnitude lower than picotechnology, at the scale of 10 −12 m, and six orders of magnitude lower than nanotechnology, at the scale of 10 −9 m.
The definition, agreement, and practical use of units of measurement have played a crucial role in human endeavour from early ages up to the present. A multitude of systems of units used to be very common. Now there is a global standard, the International System of Units (SI), the modern form of the metric system.