Any conductive substance injected into pure silicon to form a semi-conductor.
An additional or extra component of a pure gas or gas mixture. Impurities are most commonly encountered in pure material used as the raw material source for a component of a gas mixture. An impurity may be removed by purification. Alternatively, the impurity may be measured and accounted for during blending, thereby preventing it from becoming a contaminant.
Something that makes a substance impure, contaminated, or polluted. Impurities can be found in solids, liquids, or gases.
A substance contained in a product other than the desired substance
Any component of the drug substance that is not the chemical entity defined as the drug substance
Impurities are substances inside a confined amount of liquid, gas, or solid, which differ from the chemical composition of the material or compound.