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Encyclopedia > Ångström

An angstrom or ångström (Å) is a non-SI unit of length equal to 10−10 metres, 0.1 nanometres or 100 picometres. The International System of Units (abbreviated SI from the French phrase, Système International dUnités) is the most widely used system of units. ... The word unit means any of several things: The natural or usual or smallest measure of something, of which there are multiples and of which there may be fractions. ... In general English usage, length (symbol: l) is but one particular instance of distance – an objects length is how long the object is – but in the physical sciences and engineering, the word length is in some contexts used synonymously with distance. Height is vertical distance; width (or breadth) is... The metre (American spelling: meter), symbol: m, is the basic unit of distance (or of length, in the parlance of the physical sciences) in the International System of Units. ... A nanometre (American spelling: nanometer) is 1. ... Picometre (American spelling: picometer) is an SI measure of length that is equal to 10−12 of a metre. ...

The angstrom is named after the Swedish physicist Anders Jonas Ångström, one of the founders of spectroscopy. It is often used for expressing the sizes of atoms, whose radii are between 0.25 and 3 Å, and the lengths of chemical bonds, which are typically between 1 and 2 Å. For a list of objects of size 1 to 10 Å, see 1 E-10 m. The word physicist should not be confused with physician, which means medical doctor. ... Anders Jonas Ångström Anders Jonas Ångström (August 13, 1814 – June 21, 1874) was a physicist in Sweden, one of the founders of the science of spectroscopy. ... Spectroscopy is the study of spectra, ie. ... Properties For alternative meanings see atom (disambiguation). ... In chemistry, a chemical bond is the force, which holds together atoms in molecules or crystals. ... To help compare different orders of magnitude this page lists lengths between 100 pm and 1 nm (10-10 m and 10-9 m). ...

This is a non-SI unit, and therefore its use is officially discouraged. It is listed in Table 8 of the SI brochure ("Other non-SI units currently accepted for use with the International System"). BIPM explains "Table 8 lists some other non-SI units which are currently accepted for use with the SI to satisfy the needs of commercial, legal and specialized scientific interests. These units should be defined in relation to the SI in every document in which they are used. Their use is not encouraged." The International System of Units (abbreviated SI from the French phrase, Système International dUnités) is the most widely used system of units. ... The Bureau International des Poids et Mesures (International Bureau of Weights and Measures, or BIPM) is a standards organization, one of the three organizations established to maintain the SI system under the terms of the Metre Convention. ...

Nanometres or picometres can easily be used instead. However, despite its official deprecation, many scientists continue to use it. They claim it is a more convenient unit, corresponding more closely to the size of the items being discussed, e.g. atoms, grains of interstellar dust, optical wavelengths, etc. Interstellar cloud is the generic name given to accumulations of gas and dust in our galaxy. ... The wavelength is the distance between repeating units of a wave pattern. ...

For historical reasons, astronomers prefer to use the angstrom when working with visible-light spectra. An astronomer or astrophysicist is a scientist whose area of research is astronomy or astrophysics. ... The optical spectrum (light or visible spectrum) is the portion of the electromagnetic spectrum that is visible to the human eye. ...

Unicode includes the "angstrom sign" at U+212B (in your browser it looks like ); still the standard states that the "preferred representation is 00C5" — i.e. it is better to use "Latin capital letter with ring above" (Å). The "angstrom sign" is canonically decomposed into U+00C5 — i.e. it is a singleton. In computing, Unicode is the international standard whose goal is to provide the means to encode the text of every document people want to store in computers. ... A web browser is a software package that enables a user to display and interact with documents hosted by web servers. ... In Unicode, canonical decomposition is a process of converting composite characters into canonically-ordered strings of simpler characters using Unicode canonical mappings. ... Generally, a singleton is something which exists alone in some way. ...

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