In this situation it is generally uncommon to talk about half-life in the first place, but sometimes people will describe the decay in terms of its "first half-life", "second half-life", etc., where the first half-life is defined as the time required for decay from the initial value to 50%, the second half-life is from 50% to 25%, and so on. In a decay process that is not even close to exponential, the half-life will change dramatically while the decay is happening. The term "half-life" is almost exclusively used for decay processes that are exponential (such as radioactive decay or the other examples above), or approximately exponential (such as biological half-life discussed below). ![]() In a first-order reaction the half-life of the reactant is ln(2)/ λ, where λ (also denoted as k) is the reaction rate constant. In a chemical reaction, the half-life of a species is the time it takes for the concentration of that substance to fall to half of its initial value. ![]() For this example the term half time tends to be used rather than "half-life", but they mean the same thing.
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