Episode 42

PPM and PPB

Eric explains what parts-per-million (PPM) and parts-per-billion (PPB) mean. They are standard units of measurement for water chemistry, telling the density of a dissolved substance in water. And the measurement is rooted in the metric system.

Rule Your Pool

October 20, 202114m 4s

Original episode page

Show Notes

00:00 - Intro

01:59 - PPM = parts per million. It's the density of a given substance dissolved in water. It's the ratio of that substance compared to water. 1 PPM means the dissolved substance is one-millionth of the volume of water.

03:47 - PPM = mg/L. Converting from the metric system it makes sense. 1 cubic meter of water contains 1000 Liters. Each liter contains 1000 mL. Then we switch to solids, because we're talking about dissolved substances. 1 mL = 1000 mg.

07:00 - Brief overview of chemistry targets that use PPM

10:16 - Phosphates are measured in PPB, not PPM. Parts per billion is one-thousandth of a PPM. 1000 ppb = 1 ppm.

11:56 - Conclusion. Thanks for listening!

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