Title 40: Protection of Environment
PART 60—STANDARDS OF PERFORMANCE FOR NEW STATIONARY SOURCES
Subpart A—General Provisions
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§ 60.3 Units and abbreviations.
Used in this part are abbreviations and symbols of units of measure. These are defined as follows:
(a) System International (SI) units of measure:
A—ampere
g—gram
Hz—hertz
J—joule
K—degree Kelvin
kg—kilogram
m—meter
m3 —cubic meter
mg—milligram—10−3gram
mm—millimeter—10−3meter
Mg—megagram—106 gram
mol—mole
N—newton
ng—nanogram—10−9gram
nm—nanometer—10−9meter
Pa—pascal
s—second
V—volt
W—watt
Ω—ohm
µg—microgram—10−6gram
(b) Other units of measure:
Btu—British thermal unit
°C—degree Celsius (centigrade)
cal—calorie
cfm—cubic feet per minute
cu ft—cubic feet
dcf—dry cubic feet
dcm—dry cubic meter
dscf—dry cubic feet at standard conditions
dscm—dry cubic meter at standard conditions
eq—equivalent
°F—degree Fahrenheit
ft—feet
gal—gallon
gr—grain
g-eq—gram equivalent
hr—hour
in—inch
k—1,000
l—liter
lpm—liter per minute
lb—pound
meq—milliequivalent
min—minute
ml—milliliter
mol. wt.—molecular weight
ppb—parts per billion
ppm—parts per million
psia—pounds per square inch absolute
psig—pounds per square inch gage
°R—degree Rankine
scf—cubic feet at standard conditions
scfh—cubic feet per hour at standard conditions
scm—cubic meter at standard conditions
sec—second
sq ft—square feet
std—at standard conditions
(c) Chemical nomenclature:
CdS—cadmium sulfide
CO—carbon monoxide
CO2—carbon dioxide
HCl—hydrochloric acid
Hg—mercury
H2O—water
H2S—hydrogen sulfide
H2SO4—sulfuric acid
N2—nitrogen
NO—nitric oxide
NO2—nitrogen dioxide
NOX—nitrogen oxides
O2—oxygen
SO2—sulfur dioxide
SO3—sulfur trioxide
SOX—sulfur oxides
(d) Miscellaneous:
A.S.T.M.—American Society for Testing and Materials
[42 FR 37000, July 19, 1977; 42 FR 38178, July 27, 1977]
