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Безразмерни единици за следови и ултра-следови съдържания Източници | Навигацияparts per notation – ppm, ppb

Единици за измерванеБезразмерни величини













Безразмерни единици за следови и ултра-следови съдържания




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Безразмерните единици за следови и ултра-следови съдържания на химични елементи са:[1]



  • процент (%, pph) - части на сто (на английски: parts per hundred)


  • промил (‰) - части на хиляда


  • ppm — части на милион (на английски: parts per million)


  • ppb — части на милиард (на английски: parts per billion)


  • ppt — части на трилион (на английски: parts per trillion)


  • ppq — части на квадрилион (на английски: parts per quadrillion)

Израз в метрични единици за маса:


  • 1 % = 1x10-2 g/g = 1 cg/g

  • 1 ‰ = 1x10-3 g/g = 1 mg/g

  • 1 ppm = 1x10-6 g/g = 1 µg/g

  • 1 ppb = 1x10-9 g/g = 1 ng/g

  • 1 ppt = 1x10-12 g/g = 1 pg/g

  • 1 ppq = 1x10-15 g/g = 1 fg/g


Източници |



  1. ↑ parts per notation – ppm, ppb. // chembuddy.com. Посетен на 6 април 2012. (на английски)









Взето от „https://bg.wikipedia.org/w/index.php?title=Безразмерни_единици_за_следови_и_ултра-следови_съдържания&oldid=9381699“.










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