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POS
CIDE DICTIONARY
half-hour | half-hourly | half-intensity | half-learned | half-length | half-life | half-light | half-mast | half-moon | half-pay | half-penny

half-life

 : 
Noun

CIDE DICTIONARY

half-lifen. 
     the time it takes for one-half of a substance decaying in a first-order reaction to be destroyed. For radioactive substances, it is the time required for one-half of the initial amount of the radioactive isotope to decay. The half-lifeis a measure of the rate of the reaction being observed. For processes that are true first-order processes, such as radioactive decay, the half-life is independent of the quantity of material present, and it is thus a constant. The time it takes for one-half the remaining quantity of a radioactive isotope to decay will be the same regardless of how far the decay process has advanced. Some chemical reactions are also first order, and may be characterized as having a half-life. However, for chemical reactions the half-life will depend upon temperature and in some cases other environmental conditions, whereas for radioactive isotopes the rate of decay is largely independent of the environment.  [PJC]

For further exploring for "half-life" in Webster Dictionary Online


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