| 单词 | atomic mass |
| 释义 | atomic mass (once / 1181932 pages) n Use the noun atomic mass when you're talking about the mass of an atom's protons, neutrons, and electrons. You'll come across the term atomic mass if you study chemistry, in which it refers to a single atom of some chemical and the total mass of that atom. The unit of measurement is an "atomic mass unit" or amu. Mass is a measurement in science which is essentially the same as weight, without taking changes in gravity into account, and atomic means "of an atom." The two were first combined into atomic mass in the mid-1800s. WORD FAMILYatomic mass: atomic masses USAGE EXAMPLESIsotopes are forms of an element that have different atomic masses but retain similar chemical properties. New York Times(Nov 06, 2016) In fact, it’s been suggested that the 7 in 7-Up refers to the atomic mass of the lithium. New York Times(Sep 13, 2014) Cassini's plasma spectrometer has seen evidence for hydrocarbons with an atomic mass thousands of times heavier than a single hydrogen atom. BBC(Oct 01, 2013) n (chemistry) the mass of an atom of a chemical element expressed in atomic mass units Syn|Hypo|Hyper atomic weight, relative atomic mass combining weight, eq, equivalent, equivalent weight the atomic weight of an element that has the same combining capacity as a given weight of another element; the standard is 8 for oxygen meq, milliequivalentone-thousandth of an equivalent mass the property of a body that causes it to have weight in a gravitational field |
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