| 单词 | elementary charge |
| 释义 | > as lemmaselementary charge elementary charge n. Physics the electrical charge on a single proton, equal to approx. 1.602 × 10−19 coulombs; symbol e or qe.The value of the elementary charge was first calculated in 1909 by Robert Millikan and Harvey Fletcher by measuring the equal but opposite charge on the electron. Although there are particles having a smaller electrical charge than the proton (or electron), these cannot exist independently of other particles.In 2018 the General Conference on Weights and Measures agreed that, as part of the redefinition of the ampere, the value of the elementary charge would from May the following year be set at exactly 1.602176634 × 10−19 coulombs, having previously been given as 1.6021766208(98) × 10−19 C (where the figure in parentheses represents the standard uncertainty due to errors in measurement). ΚΠ 1909 Physical Rev. 28 315 e = elementary charge. 1958 W. Heisenberg Physics & Philos. ix. 151 The nucleus in the middle of the atom..contains almost its entire mass. Its positive electric charge, which is an integer multiple of the so-called elementary charge, determines the number of the surrounding electrons. 2008 A. Bettini Introd. Elem. Particle Physics i. 20 There are three quarks with electric charge +2/3 (in units of the elementary charge). < as lemmas |
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