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expressed as g/t.
* One part per billion (ppb) denotes one part per 1,000,000,000 parts, and a value of . This is equivalent to about three seconds out of a century.
* One part per trillion (ppt) denotes one part per 1,000,000,000,000 parts, and a value of . This is equivalent to about thirty seconds out of every million years.
* One part per quadrillion

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