| 单词 | carbon 12 |
| 释义 | carbon 12nounthe isotopic carbon atom that comprises 99 percent of naturally occurring carbon, and that since 1961 has been used as the standard for atomic weight by representing a unit of 12.00000. Also car·bon-12 [kahr-buhn-twelv]. /ˈkɑr bənˈtwɛlv/. Origin of carbon 12First recorded in 1940–45 Words nearby carbon 12carbo-loading, Carboloy, carboluria, car bomb, carbon, carbon 12, carbon 13, carbon 14, carbon-14 dating, carbonaceous, carbonade Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Scientific definitions for carbon 12carbon 12 A stable isotope of carbon, having six protons and six neutrons in the nucleus. Carbon 12 makes up most naturally occurring carbon. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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