In chemistry what is a half life?

Answer 1

The half-life of a quantity whose value decreases with time is the interval required for the quantity to decay to half of its initial value. The concept originated in describing how long it takes atoms to undergo radioactive decay but also applies in a wide variety of other situations.

Half-lives are very often used to describe quantities undergoing exponential decay-for example radioactive decay-where the half-life is constant over the whole life of the decay, and is a characteristic unit (a natural unit of scale) for the exponential decay equation. However, a half-life can also be defined for non-exponential decay processes, although in these cases the half-life varies throughout the decay process. The converse for exponential growth is the doubling time.

Answer 2

A half-life is the time it takes for half of the atoms in a sample of a radioactive substance to decay. It is a constant characteristic of each radioactive isotope and is used to determine the rate of decay of a substance.

Answer 3

It's more in physics than chemistry but a half-life it the time taken for half the radionucleii in a radioactive substance to decay.