mean life

noun

Physics.

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

2. decay time.

mean life

noun

1. τ. 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 15

Example Sentences

Ms Ming said that "life should mean life".

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“Really, it can mean life or death in a lot of cases where you don’t get the information, where it’s not translated in a city and county like Los Angeles.”

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"He killed my son. Life should mean life, however I understand the judicial system, and there has to be a tariff set in place," she said.

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During natural disasters and extreme weather, employers’ choices can sometimes mean life or death, said David Michaels, a professor at the Milken Institute School of Public Health and a former assistant secretary of labor for the Occupational Safety and Health Administration.

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“That is hugely significant, because if that happens twice in our solar system, it could mean life is really common,” he says.

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