| 单词 | down quark |
| 释义 | down quark in American English Particle Physics a type of quark with a mass of c. 0.005 to 0.015 GeV/c2, a negative charge that is 1⁄3 the charge of an electron, zero charm, and zero strangeness see also flavor (sense 5)down quark in American Englishnoun Physics the quark having electric charge −1⁄3 times the elementary charge, with strangeness, charm, and other quark quantum numbers equal to 0 Also called: d quark Word origin [1975–80]This word is first recorded in the period 1975–80. Other words that entered Englishat around the same time include: gravitational lens, gridlock, hybridoma, surrogate mother, videotexExamples of 'down quark' in a sentence |
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