HACH LANGE ORBISPHERE 3654, User Manual, Page: 55 / 58

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Section 10 Glossary of Terms
10.1 Common units
10.2 Terms and definitions
Table 11 Common units
Unit Meaning
% percentage, by weight
% vbar percentage per volume, barometric pressure referenced
% vext percentage per volume, sample pressure compensated
cc/kg cubic centimeters per kilogram
g/kg grams per kilogram
mg/L milligrams per liter
mL/L milliliters per liter
ppb parts per billion, by weight
ppm parts per million, by weight
v/v volume per volume (ratio)
Table 12 Terms and definitions
Terms Meaning
Absolute pressure Absolute pressure is relative pressure, plus atmospheric pressure
Concentration The relative content of a component in a gaseous or liquid media.
Conductivity The reciprocal of electrical resistivity.
Headspace The empty volume above a liquid or solid in a closed container.
Relative pressure
Relative pressure is absolute pressure, less atmospheric pressure (this is
the customary gauge reading).
Resistivity
The opposition offered by a body or substance to the passage through it of a
steady electric current.