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- (anthropology, archaeology) a notable accumulation of archaeological materials in a small area, such as a "concentration of flakes" etc.
- (chemistry) Amount of solute per unit volume or mass of solvent or of solution.
- (economic) A measure of the degree to which a few large firms dominate total sales, production, or capacity within an industry or market. The concern is that the more concentrated an industry, the greater the likelihood of price and market manipulation. For example, meat packer concentration has long been a concern of cattle producers. It is common to express concentration as a ratio, by stating the share (%) held by the top 4, 8, or 12 firms.
- (environment) The relative amount of a substance mixed with another substance. An example is five ppm of carbon monoxide in air or 1 mg/l of iron in water.
Source: Terms of the Environment
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