Lifetime

In science, a lifetime is a defunct scientific term, referring to the period of time in which an entity, anthropomorphized, in some cases, as being "alive", whether a subatomic particle, an atom, molecule, chemical species, human molecule, planet, star, galaxy, star, etc., exists as a distinguishable bound state structure.

In chemistry, the lifetime of a species can be generalized as twice the half-life of the species population.

In biology (powered chnopsology), a lifetime is often characterized as the start to finish period comprising an organism's 'life cycle'.

In physics, lifetime is defined as the average time of existence of an elementary particle or radioactive nucleus in a certain state before decay occurs or before there is a transition from an excited state to a lower state. [1]

Difficulties on term
In colloquial use, life time is defined in two ways: [2]

The period of time during which: an individual is alive.
The period of time during which: property, an object, a process, or a phenomenon exists or functions.

The difficulty or inconsistency between these two incongruent definitions is that individuals cannot technically be alive. [3] Subsequently, further uniformity and correction is needed in the former definition.

References
1. Daintith, John. (2005). Oxford Dictionary of Physics. Oxford University Press.
2. The American Heritage Dictionary of the English Language, Fourth edition, 2009.
3. Thims, Libb. (2009). “Letter: Life a Defunct Scientific Theory”, Journal of Human Thermodynamics, Vol. 5, pgs. 20-21.

External links
‚óŹ Lifetime – Dictionary.com.

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