mean life

noun Physics.

the average time that an unstable particle or nucleus survives before it decays.
decay time.

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Also called average life, lifetime.

Words nearby mean life

mean deviation, mean distance, mean free path, mean length of utterance, mean lethal dose, mean life, mean line, mean noon, mean planet, mean proportional, mean sea level
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British Dictionary definitions for average life

mean life

noun

physics 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 15Symbol: τ
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012