Question

Define (1) PPM (2) PPB​

Answer 1

Answer:

PPM and PPB are units used in atmospheric chemistry to describe the concentration of gases. PPM stands for parts of gas per million parts of air, and PPB is parts per billion. If that's not easy to imagine, try these examples: Part per million (ppm): 1 second in just under 2 weeks.

Explanation:

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Answer 2

parts per million

parts per billon