TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 OBS

A land mass on Great Colinet Island, in Newfoundland and Labrador.  2, record 1, English, - Dalton%20Point

Record number: 1, Textual support number: 2 OBS

Coordinates: 47° 0' 50" N, 53° 41' 4" W (Newfoundland and Labrador).  1, record 1, English, - Dalton%20Point

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 OBS

Étendue de terre sur la Grande île Colinet, à Terre-Neuve-et-Labrador.  1, record 1, French, - pointe%20Dalton

Record number: 1, Textual support number: 2 OBS

Coordonnées : 47° 0' 50" N, 53° 41' 4" O (Terre-Neuve-et-Labrador).  2, record 1, French, - pointe%20Dalton

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 DEF

"atomic mass unit": An arbitrarily defined unit in terms of which the masses of individual atoms are expressed: the standard is the unit of mass equal to 1/12 the mass of the carbon atom, having as nucleus the isotope with mass number 12.  7, record 2, English, - atomic%20weight%20unit

Record number: 2, Textual support number: 2 DEF

"atomic mass unit": For an element, it is the number which specifies how many times heavier one atom of the element is than one atom of hydrogen. The atomic mass unit is the unit of measure of the mass particle (atom, molecule, ion, etc.). The numerical value of the mass of a particle in amu,s is identical with the older atomic weight. The symbol is m_u = 1 u and in vaccuum technology the value of this constant is 1.66056 X 10^-27kg.  8, record 2, English, - atomic%20weight%20unit

Record number: 2, Textual support number: 1 CONT

The nucleus of an atom is made up of neutrons and protons. The total mass of the neutrons and protons along with the electrons gives the mass of the atom. ... Because this value is so small, a new unit of weight, the atomic weight unit (awu), is often used to express the weights of atoms. It is defined as 1/12 the weight of carbon atoms.  2, record 2, English, - atomic%20weight%20unit

Record number: 2, Textual support number: 1 OBS

Prior to Sept. 8, 1960, natural oxygen, a mixture of isotopes, served as the standard of reference with an assigned atomic weight of 16.0000 exactly.  2, record 2, English, - atomic%20weight%20unit

Record number: 2, Textual support number: 2 OBS

Historically the term "atomic weight unit" was the chemists' standard of reference for atomic weight and it was based on the weight of natural oxygen. "Atomic mass unit" was the term preferred by physicists and it was based on the oxygen-16 isotope. (See FREMA, 1960, p. 58 and MHECH, 1983, p. 171).  9, record 2, English, - atomic%20weight%20unit

Record number: 2, Textual support number: 3 OBS

The term "dalton", which is defined as 1/16th the mass of oxygen-16, is rarely used nowadays in referring to atomic mass unit because oxygen no longer serves as standard of reference.  9, record 2, English, - atomic%20weight%20unit

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 CONT

En accord avec les recommandations de la Commission des poids atomiques, on appelle poids atomique d'un élément (ou coefficient atomique) le poids moyen relatif des atomes d'un élément en unité de masse atomique, cette unité étant le douzième de la masse de l'isotope 12 [indice]C; cette Commission a recommandé d'utiliser la désignation poids atomique pour les éléments qui sont, pour la plupart d'entre eux à l'état naturel, des mélanges de nuclides et de réserver celle de masse atomique pour les nuclides isolés.  4, record 2, French, - unit%C3%A9%20de%20masse%20atomique

Record number: 2, Textual support number: 1 OBS

L'établissement de tables de poids atomiques [...]. [...] J. Stas [...] choisit, en 1850, comme unité de référence la seizième partie du poids atomique de l'oxygène. À partir de 1920, les physiciens prirent comme étalon la masse de l'isotope 16₀, à laquelle ils attribuèrent la valeur 16,000 00 g tandis que les chimistes continuaient à prendre la valeur 16,000 00 pour le poids atomique de l'oxygène naturel [...]. Mais, les deux échelles ne concordaient pas exactement et la valeur numérique du poids atomique était plus petite dans l'échelle chimique [atomic weight unit] que dans l'échelle physique [atomic mass unit], ce qui entraînait des confusions. [...] on décida [...] que l'échelle chimique basée sur la valeur 16,000 00 pour l'oxygène naturel devait être abandonnée. En 1961, les Unions internationales de physique pure et appliquée et de chimie pure et appliquée prirent la décision de recommander une modification de l'échelle des poids atomiques et d'attribuer un poids atomique de 12 à l'isotope du carbone 12 [indice]C, ce qui nécessitait de recalculer les tables de poids atomiques sur la base de 12 [indice]C =12.  4, record 2, French, - unit%C3%A9%20de%20masse%20atomique

Record 2,  Textual support,  Spanish

Record number: 2, Textual support number: 1 DEF

"unidad másica": Dozava parte de la masa del átomo de carbono-12. Sinónimo: "unidad de masa atómica".  3, record 2, Spanish, - unidad%20de%20masa%20at%C3%B3mica

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 DEF

[The law that] states that the total pressure of a mixture of gases under given conditions is the sum of the partial pressures of the individual gases under the same conditions, the partial pressure of a component gas being defined as the pressure that would be exerted by that gas if it were present alone.  3, record 3, English, - Dalton%26rsquo%3Bs%20Law%20of%20Partial%20Pressure

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 DEF

Loi selon laquelle la pression d'un mélange gazeux est la somme des pressions partielles qu'aurait chacun des gaz s'il occupait seul, à une même température, le volume du mélange.  2, record 3, French, - loi%20de%20Dalton

Record number: 3, Textual support number: 1 OBS

Cette loi exacte pour les gaz parfaits n'est qu'approchée pour les gaz réels.  2, record 3, French, - loi%20de%20Dalton

Record 3,  Textual support,  Spanish

Record number: 3, Textual support number: 1 DEF

Ley que establece que la presión de una mezcla gaseosa es igual a la suma de las presiones parciales que ejercerían cada uno de sus componentes si ocupasen, de forma aislada, el volumen total de aquella a su misma temperatura.  1, record 3, Spanish, - ley%20de%20Dalton%20de%20las%20presiones%20parciales

Record 4,  Textual support,  English

Record number: 4, Textual support number: 1 DEF

A unit of mass ... [which] designates 1/16th of the mass of oxygen^-16, the lightest and most abundant isotope of oxygen. Since this is 15.9949, the dalton is equivalent to 0.9997 mass unit.  1, record 4, English, - dalton

Record number: 4, Textual support number: 1 OBS

See also "atomic weight unit" and "atomic weight".  2, record 4, English, - dalton

Record 4,  Textual support,  French

Record number: 4, Textual support number: 1 DEF

Unité de masse atomique, le seizième de la masse d'un atome moyen d'oxygène; abréviation : d (Vx).  1, record 4, French, - dalton

Record number: 4, Textual support number: 1 OBS

Voir aussi «unité de masse atomique» et «masse atomique».  2, record 4, French, - dalton

Record 4,  Textual support,  Spanish