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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]
Pages for logged out editors learn more. Contributions; Talk; Femtometer
The proton radius puzzle is an unanswered problem in physics relating to the size of the proton. [1] Historically the proton charge radius was measured by two independent methods, which converged to a value of about 0.877 femtometres (1 fm = 10 −15 m).
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 Cambridge Grammar of the English Language distinguishes between an answer (being a member of the set of logically possible answers, as delineated in § Semantic classification) and a response (any statement made by the addressee in reply to the question). [1]
While targeting "English language students and researchers" (p. 45), an abridged version of the grammar was released in 2002, Longman Student Grammar of Spoken and Written English, together with a workbook entitled Longman Student Grammar of Spoken and Written English Workbook, to be used by students on university and teacher-training courses.