Federal Register - June 29, 2021
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Source: Federal Register
34586
Federal Register / Vol. 86, No. 122 / Tuesday, June 29, 2021 / Rules and Regulations TABLE 1 OF 1066.1005SYMBOLS FOR QUANTITIESContinued Quantity
Unit
Unit symbol
p
Dp
pd
pressure
differential static pressure
saturated vapor pressure at ambient dry bulb temperature.
penetration fraction.
mass density
dynamometer roll revolutions
ratio of pressures
coefficient of determination.
Reynolds number.
response factor.
relative humidity.
Sutherland constant
standard error of the estimate.
specific gravity.
distance traveled during measurement interval.
absolute temperature
Celsius temperature
torque moment of force
time
time interval, period, 1/frequency
voltage
speed
volume
flow volume rate
pascal
pascal
kilopascal
Pa
Pa
kPa
m1kgs2.
m1kgs2.
m1kgs1.
kilogram per cubic meter
revolutions per minute
pascal per pascal
kg/m3
rpm
Pa/Pa
m3kg.
301s1.
1.
kelvin
K
K.
meters
m
m.
kelvin
degree Celsius
newton meter
hour or second
second
volt
miles per hour or meters per second
cubic meter
cubic feet per minute or cubic meter per second.
K
C
Nm
hr or s
s
V
mi/hr or m/s
m3
ft3/min or m3/s
K.
K273.15.
m2kgs2.
s.
s.
m2kgs3A1.
ms1.
m3.
m3/s1.
part per million
ppm.
PF
r
R
r
r2
Re
RF
RH
S
SEE
SG
Ds
T
T
T
t
Dt
U
v
V
V
VP
x
y
Z
volume percent.
concentration of emission over a test interval.
generic variable.
compressibility factor.
c Superscripts. This part uses the following superscripts for modifying quantity symbols:
d Subscripts. This part uses the following subscripts for modifying quantity symbols:
TABLE 3 OF 1066.1005
SUPERSCRIPTS
Superscript
Meaning
overbar such as y
overdot such as y
arithmetic mean.
quantity per unit time.
TABLE 4 OF 1066.1005SUBSCRIPTS
Subscript
lotter on DSK11XQN23PROD with RULES2
Unit in terms of SI
base units
Symbol
Meaning
0
abs
AC17
act
actint
adj
air
atmos
b
bkgnd
c
comp
cor
cs
ct
cUDDS
D
dew
dexh
dil
e
emission
error
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01:55 Jun 29, 2021
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reference.
absolute quantity.
air conditioning 2017 test interval.
actual or measured condition.
actual or measured condition over the speed interval.
adjusted.
air, dry.
atmospheric.
base.
background.
cold.
composite.
corrected.
cold stabilized.
cold transient.
cold-start UDDS.
driven.
dewpoint.
dilute exhaust quantity.
dilute.
effective.
emission specie.
error.
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