Notatio partium-per in scientia et arte ingeniaria, est copia unitatum falsarum ad describendas parvas aestimationes variarum quantitatum sine dimensione (e.g.
pars molis et pars massae) adhibita. Quia hae partes sunt mensurae quantitatis per quantitatem, eae sunt numeri purae, coniunctionibus unitatum mensurae carentes. Notationes usitate adhibitae sunt ppm (partes per millionem, 10–6), ppb (partes per billionem, 10–9), ppt (partes per trillionem, 10–12), et ppq (partes per quadrillionem, 10-15).
Discrepat usus notationis partium-per a norma technica ISO 80000-1:2009, clausa 6.5.5, atque ergo falsus est. Germanae rationum expressiones in quodam volumine vel massa rite dantur per potestates decem per metrum cubicum vel per chiliogramma.
Vide ppb in Victionario. |
Haec stipula ad mathematicam spectat. Amplifica, si potes! |
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