[Code of Federal Regulations]

[Title 40, Volume 9]

[Revised as of July 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 40CFR63.3]



[Page 19-20]

 

                   TITLE 40--PROTECTION OF ENVIRONMENT

 

         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)

 

PART 63_NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS FOR 

SOURCE CATEGORIES--Table of Contents

 

                      Subpart A_General Provisions

 

Sec.  63.3  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

[deg]K = degree Kelvin

kg = kilogram

l = liter

m = meter

m\3\ = cubic meter

mg = milligram = 10-3 gram

ml = milliliter = 10-3 liter

mm = millimeter = 10-3 meter

Mg = megagram = 10\6\ gram = metric ton

MJ = megajoule

mol = mole

N = newton

ng = nanogram = 10-9 gram

nm = nanometer = 10-9 meter

Pa = pascal



[[Page 20]]



s = second

V = volt

W = watt

[ohm] = ohm

[micro]g = microgram = 10-6 gram

[micro]l = microliter = 10-6 liter



    (b) Other units of measure:



Btu = British thermal unit

 [deg]C = degree Celsius (centigrade)

cal = calorie

cfm = cubic feet per minute

cc = cubic centimeter

cu ft = cubic feet

d = day

dcf = dry cubic feet

dcm = dry cubic meter

dscf = dry cubic feet at standard conditions

dscm = dry cubic meter at standard conditions

eq = equivalent

 [deg]F degree Fahrenheit

ft = feet

ft\2\ = square feet

ft\3\ = cubic feet

gal = gallon

gr = grain

g-eq = gram equivalent

g-mole = gram mole

hr = hour

in. = inch

in. H2 O = inches of water

K = 1,000

kcal = kilocalorie

lb = pound

lpm = liter per minute

meq = milliequivalent

min = minute

MW = molecular weight

oz = ounces

ppb = parts per billion

ppbw = parts per billion by weight

ppbv = parts per billion by volume

ppm = parts per million

ppmw = parts per million by weight

ppmv = parts per million by volume

psia = pounds per square inch absolute

psig = pounds per square inch gage

[deg]R = degree Rankine

scf = cubic feet at standard conditions

scfh = cubic feet at standard conditions per hour

scm = cubic meter at standard conditions

scmm = cubic meter at standard conditions per minute

sec = second

sq ft = square feet

std = at standard conditions

v/v = volume per volume

yd\2\ = square yards

yr = year



    (c) Miscellaneous:



act = actual

avg = average

I.D. = inside diameter

M = molar

N = normal

O.D. = outside diameter

% = percent



[59 FR 12430, Mar. 16, 1994, as amended at 67 FR 16598, Apr. 5, 2002]