Code of Federal Regulations Title 40. Protection of Environment § 40.86.403–78 Abbreviations

The abbreviations used in this subpart have the following meanings in both capital and lowercase:

ASTM—American Society for Testing and Materials.

C—Celsius.

cc—Cubic centimetre(s).

cfh—Cubic feet per hour.

cfm—Cubic feet per minute.

CH₄ methane.

cm—Centimetre(s).

CO—Carbon monoxide.

CO₂—Carbon dioxide.

Conc—Concentration.

cu.—Cubic.

CVS—Constant volume sampler.

EGR—Exhaust gas recirculation.

EP—End point.

EPA—Environmental Protection Agency.

F—Fahrenheit.

h—hour.

HC—Hydrocarbon(s).

Hg—Mercury.

H₂O—Water.

in.—Inch(es).

K—Kelvin.

kg—Kilogram(s).

km—Kilometre(s).

kpa—Kilopascals.

lb—Pound(s).

m—Metre(s).

mph—Miles per hour.

mm—Millimetre(s).

N₂—Nitrogen.

N₂O nitrous oxide.

NO_X—Oxides of nitrogen.

No.—Number.

O₂—Oxygen.

Pa—Pascal(s).

Pb—lead.

ppm—Parts per million by volume.

psi—Pounds per square inch.

psig—Pounds per square inch gauge.

R—Rankine.

rpm—Revolutions per minute.

wt—Weight.

°—Degree(s).

%—Percent.