Parts per billion
Parts per billion (ppb)
Parts per billion (ppb) is a term used in science and engineering to denote the proportion of a particular substance in a larger mixture. It is a unit of measurement that is used to quantify the concentration of one substance in another. The term is often used in the fields of chemistry, biology, and environmental science.
Pronunciation
- IPA: /pɑːrts pər ˈbɪljən/
Etymology
The term "parts per billion" is derived from the concept of ratios. In this case, it refers to the ratio of the quantity of a particular substance to one billion parts of the whole mixture.
Definition
In scientific and engineering contexts, one part per billion denotes one part of a substance per billion parts of the whole, often measured by mass or volume. It is equivalent to one unit of a substance per 1,000,000,000 units of the mixture.
Usage
Parts per billion is commonly used to measure the concentration of very small amounts of a substance in a mixture. For example, in environmental science, it is used to measure the concentration of pollutants in air, water, or soil. In medicine, it can be used to measure the concentration of a drug in a patient's bloodstream.
Related Terms
External links
- Medical encyclopedia article on Parts per billion
- Wikipedia's article - Parts per billion
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