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Federal Register / Vol. 86, No. 122 / Tuesday, June 29, 2021 / Rules and Regulations TABLE 1 OF 1065.1005SYMBOLS FOR QUANTITIESContinued Symbol
Quantity
SEE

standard error of the estimate.
absolute temperature
Celsius temperature
torque moment of force.
plane angle
time
time interval, period, 1/
frequency.
volume
volume rate
work
carbon mass fraction
amount of substance mole fraction.2
flow-weighted mean concentration.
generic variable.
compressibility factor.

T
T
T
q
t
t
V
V
W
wC
x
X
y
Z

Unit
Unit symbol
Units in terms of SI base units
kelvin
degree Celsius
newton meter

K
C
Nm

K.
K273.15.
m2 kg s2.

degrees
second
second

s
s

rad.
s.
s.

cubic meter
cubic meter per second kilowatt-hour
gram per gram
mole per mole

m3
m3/s
kWhr
g/g
mol/mol

m3.
m3 s1.
3.6 106 m2 kg s2.
1.
1.

mole per mole

mol/mol

1.

1 See paragraph f2 of this section for the values to use for molar masses. Note that in the cases of NO and HC, the regulations specify efX
fective molar masses based on assumed speciation rather than actual speciation.
2 Note that mole fractions for THC, THCE, NMHC, NMHCE, and NOTHC are expressed on a C -equivalent basis.
1

c Prefixes. This part uses the following prefixes for units and unit symbols:

TABLE 3 OF 1065.1005
PREFIXESContinued
TABLE 3 OF 1065.1005PREFIXES
Symbol
Prefix name
m
c

micro
milli
centi

Symbol
Prefix name
k
M

kilo
mega

TABLE 4 OF 1065.1005
SUPERSCRIPTS

Factor 103
106

Superscript
Meaning
overbar such as y
overdot such as y

arithmetic mean.
quantity per unit time.

Factor 106
103
102

d Superscripts. This part uses the following superscripts for modifying quantity symbols:

e Subscripts. This part uses the following subscripts for modifying quantity symbols:

TABLE 5 OF 1065.1005SUBSCRIPTS

lotter on DSK11XQN23PROD with RULES2

Subscript
Meaning
a
abs
act
air
amb
atmos
bkgnd
C
cal
CFV
comb
comp
cor
dil
dew
dexh
dry
dutycycle
exh
exp
fluid
fn
frict
fuel
hi,idle
i
idle
in

VerDate Sep<11>2014

01:55 Jun 29, 2021

Jkt 253001

absolute e.g., absolute difference or error.
absolute quantity.
actual condition.
air, dry.
ambient.
atmospheric.
background.
carbon mass.
calibration quantity.
critical flow venturi.
combined.
composite value.
corrected quantity.
dilution air.
dewpoint.
diluted exhaust.
dry condition.
duty cycle.
related to a difference or error quantity.
raw exhaust.
expected quantity.
fluid stream.
feedback speed.
friction.
fuel consumption.
condition at high-idle.
an individual of a series.
condition at idle.
quantity in.

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