Hach 3654 Portable H2/N2 Analyzer manual Appendix a Glossary, Common Units, Terms and Definitions

3654 Portable H2/N2 Analyzer - Glossary 61 of 66

Appendix A: Glossary

A.1 Common Units

Table A-1: 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)

A.2 Terms and Definitions

Table A-2: 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.

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