| 单词 | mass defect |
| 释义 | > as lemmasmass defect mass defect n. a deficiency of mass; (Nuclear Physics) the sum of the masses of the constituent particles of a nucleus, as free individuals, minus the mass of the nucleus (a quantity which effectively represents the binding energy of the nucleus). ΘΚΠ the world > matter > physics > atomic nucleus > [noun] > sum of protons and neutrons in mass > less mass of nucleus mass defect1924 1924 J. G. A. Skerl tr. A. Wegener Orig. Continents & Oceans xi. 160 Subterranean mass-defect and mass-excess above the sea-level..mutually counterbalance, isostasy thus prevailing in mountain masses. 1927 F. W. Aston in Proc. Royal Soc. A. 115 510 There would have been no loss of energy, that is mass defect, in the latter [sc. alpha particles] to represent the binding forces holding the four particles together. 1989 R. Dryer & G. Lata Exper. Biochem. i. iii. 43 This accounts for the..mass defect, based on the observation that atomic weights of the heavier elements are not exact multiples of the hydrogen mass. < as lemmas |
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