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... > Physical system > Sample > Sample component > Material > Material description > Structure (Material) > Micro structure > Micro structure feature > Defect > Impurity
... > Physical system > Material > Material description > Structure (Material) > Micro structure > Micro structure feature > Defect > Impurity

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Impurity  

定义

  • 1. A chemical role played by any unwanted chemical substance inside a confined amount of liquid, gas, or solid, which differs from the chemical composition of the material or compound. For example, an impurity can be an undesired by-product of a chemical reaction or manufacturing process, a drug contaminant, or can be created upon degradation during storage. (Ontobee, ChEBI). 2. the fact that a substance is dirty or lower in quality because it is mixed with another substance, or something that causes this (Cambridge). 3. impurities are chemical substances inside a confined amount of liquid, gas, or solid. They differ from the chemical composition of the material or compound. (Wikipedia)

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