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As an example, the radioactive decay of carbon-14 is exponential with a half-life of 5,730 years.
A quantity of carbon-14 will decay to half of its original amount (on average) after 5,730 years, regardless of how big or small the original quantity was.
Perhaps a puddle of a certain size will evaporate down to half its original volume in one day.
Simulation of many identical atoms undergoing radioactive decay, starting with either 4 atoms per box (left) or 400 (right).
While a radioactive isotope decays almost perfectly according to so-called "first order kinetics" where the rate constant is a fixed number, the elimination of a substance from a living organism usually follows more complex chemical kinetics.
Reverse One-Arm Cable Triceps Extensions isolate and emphasize the medial head, which adds length to the triceps and helps builds size around the elbow joint.
In such cases, the half-life is defined the same way as before: as the time elapsed before half of the original quantity has decayed.
However, unlike in an exponential decay, the half-life depends on the initial quantity, and the prospective half-life will change over time as the quantity decays.