: While "purity" measures the percentage of desired substance relative to impurities, an "assay" specifically determines the total amount or functional activity of that substance within a given sample. Industry Applications
: Confirming the purity of precious metals like gold and silver to ensure they meet strict investment and commercial standards. assayer
: Using chemistry, heat (such as fire assaying ), or advanced technologies like X-rays and PhotonAssay™ to measure metal content in ore. : While "purity" measures the percentage of desired