Environmental Engineering: Fundamentals and Design - Chapter 2

BOOK TABLE OF CONTENTS
CHAPTER TABLE OF CONTENTS
TOC > Ch. 2 > 2.2 Volume/volume and mole/mole units

# Chapter 2 Environmental Measurements

James R Mihelcic, Richard E. Honrath, Jr. and
Noel R. Urban

## Volume/volume and mole/mole units

### Volume/Volume Units

Volume/volume units are most often used when discussing concentrations in the atmosphere.

Units in this medium are most often expressed on a "parts per" basis. Ppmv is similar to ppmm except instead of being based on a ratio of the masses it's based on a ratio of the volumes.

#### Credits

Albuquerque Balloon Fiesta photo: Eric Ward from Wikimedia Commons.

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