Noun
PPB pl (plural only)
Initialism of parts per billion.
PPB (plural PPBs)
(economics) Initialism of production-possibility boundary.
ppb (plural ppb)
Initialism of parts per billion.
A 2014 World Health Organization advisory conference was scheduled to consider limits of 200–300 ppb for rice. Source: Internet
By fixing the Avogadro constant, the practical effect of this proposal would be that the uncertainty in the mass of a 12 C atom—and the magnitude of the kilogram—could be no better than the current 50 ppb uncertainty in the Planck constant. Source: Internet
Average benzene levels were 19 ppb, about four times tap water standard. Source: Internet
Current methane levels are about 1,800 ppb. Source: Internet
PwC's acquisition of insolvency firm PPB Advisory has set the scene for more consolidation amid a flat insolvency market. Source: Internet
Interim chief Uehara took over for chief Mike Marshman, who retired after 26 years of service at PPB and 28 years as a law-enforcement officer. Source: Internet