| 词汇 | atomic-mass |
| 释义 | atomic mass noun[ C or U ] chemistry specializeduk /əˌtɒm.ɪk ˈmæs/ us /əˌtɑː.mɪk ˈmæs/ the mass of a specific isotope of a particular chemical element, usually expressed in atomic mass units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 -pounder BMI body mass index bulk density carat centigram ct G, g gm hundredweight karat kilogram lb microgram ounce oz pound st talent ton atomic mass | American Dictionaryatomic mass noun[ U ] us/əˈtɑm·ɪk ˈmæs/ chemistry, physics the total number of protons and neutrons in the nucleus (= central part) of an atom Examples of atomic massatomic mass Heavy hydrogen could be separated from the ordinary hydrogen isotopes of atomicmass 1 at a cost of about £25,000 a ton. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 O, where the 16, 17 and 18 refer to the atomicmass. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This means low atomicmass elements are favoured. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. One unified atomicmass unit 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 relative atomicmass (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 the atomicmass unit 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 in atomicmass from 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 average atomicmass of 35.5 atomicmass units. 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 one atomicmass though 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 the atomicmass of 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 an atomicmass of about 720 u. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. However, atomic weight, ie, relative atomicmass, 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 of atomicmass. 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 low atomicmass of about four atomicmass units. 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 larger atomicmass. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. See all examples of atomic mass 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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