Elements for every million (ppm) denotes the number of units of the substance contained in 1,000,000 models of Yet another material. It's a ratio expressing the concentration of one material within A different and it is commonly used to measure the purity of drinking water, air, food solutions, and more. https://marioulykv.blogrenanda.com/43219189/the-smart-trick-of-free-ppm-calculator-that-no-one-is-discussing