| 单词 | upsilon particle |
| 释义 | upsilon particle[ ŭp′sə-lŏn′, yōōp′- ] An electrically neutral meson having a mass 18,513 times that of the electron and a mean lifetime of approximately 8.0 X 10-20 seconds. See Table at subatomic particle. Words nearby upsilon particleupside down, upside-down cake, upsides, upside the head, upsilon, upsilon particle, upsize, upskill, upspin, upspring, upstage The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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