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parts per billion (ppb)

Parts per trillion (ppb) means "parts per billion", i.e. 10exp-9 or 0.000 000 001 or 10exp-3 ppm (parts per million). Parts per trillion is a size specification used for doping specifications of semiconductors and stability values of oscillators, among other things. For example, if an OCXO oscillator is subject to an aging of 5 ppb per year, this means that its frequency changes by 5x10exp-9 per year.

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Englisch: parts per billion - ppb
Updated at: 11.06.2013
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