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Half-life refers to a property of radioactive materials. The half life in the length of time it takes half of the quantity of an element to decay and become a more stable, non radioactive element. So if a 1 kg block of a substance had a half life of 10,000 years, in 10,000 years time there would 0.5 Kg of radioactive material remaining in the block. 10,000 years later there would again only be half as much, so there would then be 0.25 Kg of the radioactive material. Every further 10,000 years the quantity of the remaining radioactive material would half.

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15y ago
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12y ago

That is the time it takes for half of the substance to change to something else. The time varies in different substances (isotopes), and can be from a fraction of a second to trillions of years.

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6mo ago

The half-life of a substance is the time it takes for half of the substance to decay or lose its potency. It is a measure of how quickly a substance breaks down or decreases in quantity over time.

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16y ago

I dont no about half life its all a load of crap!

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14y ago

The half life of a substance is the time it takes for half of the amount of the substance you have to degrade into other materials.

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11y ago

The time taken to half the initiating mass is half life

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Q: What is the half-life of a substance?
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