Impurity: n. having a subset(s) within a set which has no original correspondence with samer set and which frequently decreases the value of the original set if samer subset(s) is added to and/or exists in the set

Having or adding a foreign substance to a uniquely defined existing substance is called an impurity and in real life very few things are 100% pure. Even distilled water can be less than 100% pure due to dissolved gases or trace molecules from the distillation apparatus.

We all live in an impure world with many impurities and the real question to frequently answer is how much of an impurity is tolerable or how much of that impurity makes the substance or product intolerable, unacceptable, or substandard?

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