= Units of purity
{wiki=Category:Units_of_purity}
The term "units of purity" typically refers to the measures used to quantify the purity of a substance, particularly in chemistry and materials science. Purity indicates the extent to which a substance is free from contaminants or impurities. Here are some common ways to express and measure purity: 1. **Percentage**: Purity is often expressed as a percentage, such as "99% pure," indicating that 99 parts out of 100 are the desired substance, with the remaining 1 part being impurities.
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