One example is, PPM usually means "components for each million". If you discover out which the concentration of NO2textual content NO _2NO2​ is equivalent to one ppm, it means that if you take a "sample" of air and divide it into 1,000,000 pieces, one of them will encompass NO2text NO https://johnathanhqpmi.xzblogs.com/77149862/ppm-calculator-things-to-know-before-you-buy