| 单词 | packing fraction |
| 释义 | > as lemmaspacking fraction packing fraction n. Nuclear Physics the mass defect of an atomic nucleus divided by its mass number (or sometimes by its atomic weight), which effectively represents a measure of comparative nuclear stability (see quot. 1991). ΘΚΠ the world > matter > physics > atomic nucleus > [noun] > sum of protons and neutrons in mass > fraction packing fraction1927 1927 F. W. Aston in Proc. Royal Soc. A. 115 501 The mean gain or loss of mass per proton when the nuclear packing is changed from that of oxygen to that of the atom in question..will be called the ‘packing fraction’ of the atom and expressed in parts per 10,000. 1991 H. J. Gray & A. Isaacs Dict. Physics (ed. 3) 404/1 The packing fraction..can be represented as a function of the mass number... Positive values indicate a tendency to instability. < as lemmas |
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