92.3—Abbreviations.
The abbreviations of this section apply to all subparts of this part and have the following meanings:
ANSI—American National Standards Institute
API—American Petroleum Institute
ASTM—American Society for Testing and Materials
BHP—Brake horsepower
BSCO—Brake specific carbon monoxide
BSHC—Brake specific hydrocarbons
BSNOX—Brake specific oxides of nitrogen
°C—Celsius
cfh—cubic feet per hour
cfm—cubic feet per minute
CFV—Critical flow venturi
CL—Chemiluminescence
CO—Carbon monoxide
CO2—Carbon dioxide
cu in—cubic inch(es)
CVS—Constant volume sampler
EP—End point
EPA—Environmental Protection Agency
°F—Fahrenheit
FEL—Family emission limit
FID—Flame ionization detector
ft—foot or feet
g—gram(s)
gal—U.S. gallon
GC—Gas Chromatograph
h—hour(s)
H2O—water
HC—hydrocarbon
HFID—Heated flame ionization detector
Hg—Mercury
hp—horsepower
IBP—Initial boiling point
in—inch(es)
K—Kelvin
kg—kilogram(s)
km—kilometer(s)
kPa—kilopascal(s)
lb—pound(s)
LPG—Liquified Petroleum Gas
m—meter(s)
max—maximum
mg—milligram(s)
mi—mile(s)
min—minute
ml—milliliter(s)
mm—millimeter
mph—miles per hour
mv—millivolt(s)
N2—nitrogen
NDIR—Nondispersive infrared
NMHC—Non-methane hydrocarbons
NO—nitric oxide
NO2—nitrogen dioxide
NOX—oxides of nitrogen
No.—number
O2—oxygen
pct—percent
PM—particulate matter
ppm—parts per million by volume
ppmC—parts per million, carbon
psi—pounds per square inch
psig—pounds per square inch gauge
°R—Rankin
rpm—revolutions per minute
s—second(s)
SAE—Society of Automotive Engineers
SI—International system of units (i.e., metric)
THCE—Total hydrocarbon equivalent
U.S.—United States
V—volt(s)
vs—versus
W—watt(s)
wt—weight