Pieces for every million (ppm) denotes the amount of models of the compound contained in 1,000,000 units of another compound. It is a ratio expressing the concentration of 1 compound within just another and is particularly greatly accustomed to measure the purity of h2o, air, foodstuff products, and even more. https://kameronnmeul.activoblog.com/42237845/the-5-second-trick-for-online-ppm-calculator