- the average time of existence of an unstable or reactive entity, such as a nucleus, elementary particle, charge carrier, etc; lifetime. It is equal to the half-life divided by 0.693 15
| 单词 | mean life |
| 释义 | WordReference Random House Unabridged Dictionary of American English © 2024 mean′ life′, [Physics.]
Collins Concise English Dictionary © HarperCollins Publishers:: mean life n
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