| 单词 | atomic mass unit |
| 释义 | > as lemmasatomic mass unit atomic mass unit n. a unit used for expressing atomic masses, formerly equal to 1/ 16 of the average mass of an atom of oxygen, or of the precise mass of an atom of the isotope oxygen-16, but since 1960 equal to 1/ 12 of the mass of an atom of carbon-12; abbreviated amu. ΘΚΠ the world > matter > physics > atomic physics > [noun] > atomic mass > unit of mass unit1942 atomic mass unit1954 the world > matter > chemistry > atomic chemistry > [noun] > atoms > atomic weight or mass > atomic mass unit dalton1938 atomic mass unit1954 1954 Science 24 Dec. 1078/2 (table) Atomic mass unit..amu..1 amu=931 Mev. 1958 W. K. Mansfield Elem. Nucl. Physics i. 10 The atomic mass M, not to be confused with the molecular weight, is the mass of an isotope in atomic mass units. 1977 P. R. Ehrlich et al. Ecoscience iii. 72 One atomic mass unit is approximately the mass of a proton. 1993 Discover July 14 The world has a new champion in the hydrocarbon division: a knobby, lacy, spherical molecule made up of 1,134 atoms of carbon and 1,146 of hydrogen and weighing in at 14,776 atomic mass units. < as lemmas |
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