40 CFR § 61.03 - Units and abbreviations.

§ 61.03 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
m 2 = square meter
m 3 = cubic meter
mg = milligram = 10−3gram
mm = millimeter = 10−3meter
Mg = megagram = 10 6gram
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:

°C = degree Celsius (centigrade)
cfm = cubic feet per minute
cc = cubic centimeter
Ci = curie
d = day
°F = degree Fahrenheit
ft 2 = square feet
ft 3 = cubic feet
gal = gallon
in = inch
in Hg = inches of mercury
in H2O = inches of water
l = liter
lb = pound
lpm = liter per minute
min = minute
ml = milliliter = 10−3liter
mrem = millirem = 10−3 rem
oz = ounces
pCi = picocurie = 10−12 curie
psig = pounds per square inch gage
°R = degree Rankine
µl = microliter = 10−6liter
v/v = volume per volume
yd 2 = square yards
yr = year

(c) Chemical nomenclature:

Be = beryllium
Hg = mercury
H2O = water

(d) Miscellaneous:

act = actual
avg = average
I.D. = inside diameter
M = molar
N = normal
O.D. = outside diameter
% = percent
std = standard
[42 FR 51574, Sept. 29, 1977, as amended at 54 FR 51704, Dec. 15, 1989]

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