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- Relative_atomic_mass abstract "Relative atomic mass (symbol: Ar) is a dimensionless physical quantity, the ratio of the average mass of atoms of an element (from a single given sample or source) to 1/12 of the mass of an atom of carbon-12 (known as the unified atomic mass unit). The term is equivalent to atomic weight, which is the older term, and which is also sample (source) specific. Thus, two samples of a chemical element which is naturally found as being composed of more than one isotope, collected from two substantially different sources, are expected to have slightly different relative atomic masses (atomic weights), because isotopic concentrations typically vary slightly with the history of the source.Both the terms relative atomic mass and atomic weight are sometimes loosely used to refer to a technically different standardized expectation value, called the standard atomic weight. This value is the mean value of atomic weights of a number of "normal samples" of the element in question. For this definition, "[a] normal sample is any reasonably possible source of the element or its compounds in commerce for industry and science and has not been subject to significant modification of isotopic composition within a geologically brief period." These standard atomic weights are published at regular intervals by the Commission on Isotopic Abundances and Atomic Weights of the International Union of Pure and Applied Chemistry (IUPAC) The "standard" values are intended as mean values that compensate for small variances in the isotopic composition of the chemical elements across a range of ordinary samples on Earth, and thus to be applicable to normal laboratory materials. However, they may not accurately reflect values from samples from unusual locations or extraterrestrial objects, which often have more widely variant isotopic compositions.The standard atomic weights are reprinted in a wide variety of textbooks, commercial catalogues, wallcharts etc., and in the table below.The continued use of the terms "standard atomic weight" and "atomic weight" (of any element), as opposed to "relative atomic mass" has attracted considerable controversy since at least the 1960s, mainly due to the technical difference between weight and mass in physics. (see below).".
- Relative_atomic_mass wikiPageExternalLink 1047.
- Relative_atomic_mass wikiPageExternalLink stand_alone.pl?ele=&ascii=html&isotype=some.
- Relative_atomic_mass wikiPageExternalLink www.ciaaw.org.
- Relative_atomic_mass wikiPageID "213968".
- Relative_atomic_mass wikiPageRevisionID "603244052".
- Relative_atomic_mass hasPhotoCollection Relative_atomic_mass.
- Relative_atomic_mass subject Category:Amount_of_substance.
- Relative_atomic_mass subject Category:Chemical_properties.
- Relative_atomic_mass subject Category:Periodic_table.
- Relative_atomic_mass subject Category:Stoichiometry.
- Relative_atomic_mass comment "Relative atomic mass (symbol: Ar) is a dimensionless physical quantity, the ratio of the average mass of atoms of an element (from a single given sample or source) to 1/12 of the mass of an atom of carbon-12 (known as the unified atomic mass unit). The term is equivalent to atomic weight, which is the older term, and which is also sample (source) specific.".
- Relative_atomic_mass label "Peso atómico".
- Relative_atomic_mass label "Relative atomic mass".
- Relative_atomic_mass sameAs Relativní_atomová_hmotnost.
- Relative_atomic_mass sameAs Peso_atómico.
- Relative_atomic_mass sameAs Bobot_atom.
- Relative_atomic_mass sameAs 원자량.
- Relative_atomic_mass sameAs m.0k3nbp2.
- Relative_atomic_mass sameAs Q41377.
- Relative_atomic_mass sameAs Q41377.
- Relative_atomic_mass wasDerivedFrom Relative_atomic_mass?oldid=603244052.
- Relative_atomic_mass isPrimaryTopicOf Relative_atomic_mass.