Ppm and ppb are
A)toxic chemicals.
B)chlorinated hydrocarbons.
C)wastewater treatment strategies.
D)concentration units.

Question

Quizplus · Accepted Answer

Ppm (parts per million) and ppb (parts per billion) are concentration units used to express the amount of a substance present in a mixture or solution. They represent the number of parts of a substance per million or billion parts of the mixture or solution, respectively.

Ppm and Ppb Are