Question

what is parts per million​

Answer 1

Answer:

"parts per million" can be expressed as milligrams per liter (mg/L). This measurement is the mass of a chemical or contaminate per unit volume of water. ... One ppm is equivalent to the absolute fractional amount multiplied by one million.

Answer 2

Explanation:

In science and engineering, the parts-per notation is a set of pseudo-units to describe small values of miscellaneous dimensionless quantities, e.g. mole fraction or mass fraction. Since these fractions are quantity-per-quantity measures, they are pure numbers with no associated units of measurement.