ppb

Tanımlar (İngilizce)

1. isim Initialism of parts per billion.
2. isim Initialism of production-possibility boundary.
3. isim Initialism of parts per billion.

   “The International Organization for Standardization (ISO)² does not accept the common use of parts per billion (ppb) for two reasons: the meaning of billion is ambiguous, and parts is also ambiguous because it could refer to volume, mass, number, or some other measure.”