The Law Dictionary

Your Free Online Legal Dictionary • Featuring Black’s Law Dictionary, 2nd Ed.

PARTS PER BILLION (PPB) Definition & Legal Meaning

Definition & Citations:

A concentrated volume of a part of gas, or any other substance, compared to billion parts of the air or liquid. For instance, a rough comparison is made when a teaspoon of any substance is measured alongside an olympic sized swimming pool.


This article contains general legal information but does not constitute professional legal advice for your particular situation. The Law Dictionary is not a law firm, and this page does not create an attorney-client or legal adviser relationship. If you have specific questions, please consult a qualified attorney licensed in your jurisdiction.