| 单词 | atomic mass |
| 释义 | atomic mass noun[CorU] chemistryspecializeduk/əˌtɒm.ɪk ˈmæs/us/əˌtɑː.mɪk ˈmæs/themassof aspecificisotopeof aparticularchemicalelement, usuallyexpressedinatomicmassunits 原子质量（某化学元素同位素的质量，通常以原子质量单位的形式表达）Compare relative atomic mass atomic weightspecialized Measurements of weight & mass
atomic mass| American Dictionaryatomic mass noun[U] us/əˈtɑm·ɪk ˈmæs/chemistry,physics thetotalnumberofprotonsandneutronsin thenucleus(=centralpart)of anatom Examplesofatomic massatomic mass Heavy hydrogen could be separated from the ordinary hydrogen isotopes ofatomicmass1 at a cost of about £25,000 a ton. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under theOpen Parliament Licence v3.0 O, where the 16, 17 and 18 refer to theatomicmass. From Wikipedia  This example is from Wikipedia and may be reused under a CC BY-SA license.This means lowatomicmasselements are favoured. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.One unifiedatomicmassunit is approximately the mass of one a single proton or neutron. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.It is numerically equal to the relativeatomicmass(or atomic weight) in grams. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.It serves to define theatomicmassunit and is, by definition, equal to 1 u. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.As of 2003, at least 33 radioisotopes have also been synthesized, ranging inatomicmassfrom 60 to 92. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.For example, a sample of chlorine contains 75.8% chlorine-35 and 24.2% chlorine-37, giving an averageatomicmassof 35.5atomicmassunits. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.It also showed that a radioactive element may have more than oneatomicmassthough the chemical properties are identical. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Melting points, boiling points, and bond lengths increase with theatomicmassof the halide. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Fullerenes are comparatively large and massive objects, having anatomicmassof about 720 u. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.However, atomic weight, ie, relativeatomicmass, is a dimensionless quantity, and can not take the units of grams per mole. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.However, because oxygen-17 and oxygen-18 are also present in natural oxygen this led to two different tables ofatomicmass. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.These are significant in helium because of its lowatomicmassof about fouratomicmassunits. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.It is shorter than any other carbonhalogen bond, and shorter than single carbonnitrogen and carbonoxygen bonds, despite fluorine having a largeratomicmass. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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