Definition, Meaning & Synonyms

ppb

abbreviation

ˈpē-ˌpē-ˈbē

Definition

Parts per billion (ppb) is a unit of measurement used to describe the concentration of one substance in another, typically used for very dilute concentrations.

Examples

The water sample contained 10 ppb of lead.
The air quality report indicated a concentration of 20 ppb of ozone pollutants.
Researchers found a level of 5 ppb of mercury in the fish samples.

Meaning

PPB measures the amount of a substance per billion parts of the total. It’s commonly used in fields like chemistry, environmental science, and medicine to quantify pollutants or contaminants in air, water, and soil.