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Environmental Protection Agency § 1065.1005
Useful life means the period during
which a new engine is required to com-
ply with all applicable emission stand-
ards. The standard-setting part defines
the specific useful-life periods for indi-
vidual engines.
Variable-speed engine means an engine
that is not a constant-speed engine.
Vehicle means any vehicle, vessel, or
type of equipment using engines to
which this part applies. For purposes of
this part, the term ‘‘vehicle’’ may in-
clude nonmotive machines or equip-
ment such as a pump or generator.
Verification means to evaluate wheth-
er or not a measurement system’s out-
puts agree with a range of applied ref-
erence signals to within one or more
predetermined thresholds for accept-
ance. Contrast with ‘‘calibration’’.
We (us, our) means the Administrator
of the Environmental Protection Agen-
cy and any authorized representatives.
Work has the meaning given in
§ 1065.110.
Zero means to adjust an instrument
so it gives a zero response to a zero
calibration standard, such as purified
nitrogen or purified air for measuring
concentrations of emission constitu-
ents.
Zero gas means a gas that yields a
zero response in an analyzer. This may
either be purified nitrogen, purified
air, a combination of purified air and
purified nitrogen. For field testing, zero
gas may include ambient air.
[70 FR 40516, July 13, 2005, as amended at 73
FR 37346, June 30, 2008; 73 FR 59342, Oct. 8,
2008; 74 FR 8428, Feb. 24, 2009; 74 FR 56518,
Oct. 30, 2009; 75 FR 23058, Apr. 30, 2010]
§ 1065.1005 Symbols, abbreviations,
acronyms, and units of measure.
The procedures in this part generally
follow the International System of
Units (SI), as detailed in NIST Special
Publication 811, 1995 Edition, ‘‘Guide
for the Use of the International Sys-
tem, of Units (SI),’’ which we incor-
porate by reference in § 1065.1010. See
§ 1065.25 for specific provisions related
to these conventions. This section sum-
marizes the way we use symbols, units
of measure, and other abbreviations.
(a) Symbols for quantities. This part
uses the following symbols and units of
measure for various quantities:
Symbol Quantity Unit Unit symbol Base SI units
%............... percent .................................... 0.01 ......................................... % .................... 10
¥2
a................ atomic hydrogen to carbon
ratio.
mole per mole ......................... mol/mol ........... 1
A................ area ......................................... square meter .......................... m
2
................... m
2
A
0
............... intercept of least squares re-
gression.
A
1
............... slope of least squares regres-
sion.
β................ ratio of diameters .................... meter per meter ...................... m/m ................ 1
β................ atomic oxygen to carbon ratio mole per mole ......................... mol/mol ........... 1
C
#
.............. number of carbon atoms in a
molecule.
d................ Diameter ................................. meter ....................................... m .................... m
DR ............. dilution ratio ............................ mole per mol ........................... mol/mol ........... 1
e................. error between a quantity and
its reference.
e................ brake-specific basis ................ gram per kilowatt hour ............ g/(kW.h) .......... g.3.6
¥1.
10
6.
m
¥2.
kgs
2
F................ F-test statistic.
f................. frequency ................................ hertz ........................................ Hz ................... s
¥1
f
n
................ rotational frequency (shaft) ..... revolutions per minute ............ rev/min ........... 2
.
pi
.
60
¥1.
s
¥1
g................. ratio of specific heats ............. (joule per kilogram kelvin) per
(joule per kilogram kelvin).
(J/(kg.K))/(J/
(kg.K)).
1
K................ correction factor ...................... ................................................. ........................1
l.................. length ...................................... meter ....................................... m .................... m
μ................ viscosity, dynamic ................... pascal second ......................... Pa’s ................ m
¥1.
kg
.
s
¥1
M............... molar mass
1
........................... gram per mole ........................ g/mol .............. 10
¥3.
kg
.
mol
¥1
m............... mass ....................................... kilogram .................................. kg ................... kg
m
˙............... mass rate ................................ kilogram per second ............... kg/s ................. kg
.
s
¥1
v................. viscosity, kinematic ................. meter squared per second ..... m
2
/s ................ m
2.
s
¥1
N................ total number in series.
n................ amount of substance .............. mole ........................................ mol ................. mol
n
˙................ amount of substance rate ....... mole per second ..................... mol/s ............... mol
.
s
¥1
P................ power ...................................... kilowatt .................................... kW .................. 10
3.
m
2.
kg
.
s
¥3
PF .............. penetration fraction.
p................ pressure .................................. pascal ..................................... Pa ................... m
¥1.
kg
.
s
¥2
r................ mass density ........................... kilogram per cubic meter ........ kg/m
3
.............. kg
.
m
¥3
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