Definitions for half life

This page provides all possible meanings and translations of the word half life

Princeton's WordNet

  1. half life, half-life(noun)

    the time required for something to fall to half its initial value (in particular, the time for half the atoms in a radioactive substance to disintegrate)

Freebase

  1. Half-life

    Half-life is the amount of time required for a quantity to fall to half its value as measured at the beginning of the time period. While the term "half-life" can be used to describe any quantity which follows an exponential decay, it is most often used within the context of nuclear physics and nuclear chemistry—that is, the time required, probabilistically, for half of the unstable, radioactive atoms in a sample to undergo radioactive decay. The original term, dating to Ernest Rutherford's discovery of the principle in 1907, was "half-life period", which was shortened to "half-life" in the early 1950s. Rutherford applied the principle of a radioactive elements' half-life to studies of age determination of rocks by measuring the decay period of radium to lead-206. Half-life is used to describe a quantity undergoing exponential decay, and is constant over the lifetime of the decaying quantity. It is a characteristic unit for the exponential decay equation. The term "half-life" may generically be used to refer to any period of time in which a quantity falls by half, even if the decay is not exponential.

Translation

Find a translation for the half life definition in other languages:

Select another language:

Discuss these half life definitions with the community:


Citation

Use the citation below to add this definition to your bibliography:

Style:MLAChicagoAPA

"half life." Definitions.net. STANDS4 LLC, 2014. Web. 20 Oct. 2014. <http://www.definitions.net/definition/half life>.

Are we missing a good definition for half life?


The Web's Largest Resource for

Definitions & Translations


A Member Of The STANDS4 Network


Nearby & related entries:

Alternative searches for half life: