4. SI Derived Units Whose Names and Symbols Include SI Derived Units with Special Names and Symbols
|
Quantity
|
Name
|
Symbol
|
|
dynamic viscosity
|
pascal second
|
Pa · s
|
|
moment of force
|
newton meter
|
N · m
|
|
angular velocity
|
radian per second
|
rad/s
|
|
angular acceleration
|
radian per second squared
|
rad/s2
|
|
heat flux density, irradiance
|
watt per square meter
|
W/m2
|
|
heat capacity, entropy
|
joule per kelvin
|
J/K
|
|
specific heat capacity, specific entropy
|
joule per kilogram kelvin
|
J/(kg · K)
|
|
specific energy
|
joule per kilogram
|
J/kg
|
|
energy density
|
joule per cubic meter
|
J/m3
|
|
thermal conductivity
|
watt per meter kelvin
|
W/(m · K)
|
|
electric field strength
|
volt per meter
|
V/m
|
|
electric charge density
|
coulomb per cubic meter
|
C/m3
|
|
electric flux density
|
coulomb per square meter
|
C/m2
|
|
permittivity
|
farad per meter
|
F/m
|
|
permeability
|
henry per meter
|
H/m
|
|
molar energy
|
joule per mole
|
J/mol
|
|
molar entropy, molar heat capacity
|
joule per mole kelvin
|
J/(mol · K)
|
|
exposure (X and γ rays)
|
coulomb per kilogram
|
C/kg
|
|
absorbed dose rate
|
gray per second
|
Gy/s
|
|
radiant intensity
|
watt per steradian
|
W/sr
|
|
radiance
|
watt per square meter steradian
|
W/(m2 · sr)
|
5. Units Outside the SI that Are Accepted for Use with the SI
|
Name
|
Symbol
|
Value in SI units
|
|
minute
|
min
|
1 min = 60 s
|
|
hour
|
h
|
1 h = 60 min = 3600 s
|
|
day
|
d
|
1 d = 24 h = 86400 s
|
|
liter
|
L
|
1 L = 1 dm3 = 10−3 m3
|
|
metric tone
|
t
|
1 t = 103 kg
|
|
bel
|
B
|
1 B = 10 dB
|
|
degree (angle)
|
°
|
1° = (π/180) rad
|
|
minute (angle)
|
′
|
1′ = (1/60)° = = (π/10800) rad
|
|
second (angle)
|
″
|
1″ = (1/60)′ = = (π/648000) rad
|
|
electronvolt
|
eV
|
1 eV = 1.60218 × 10−19 J
|
|
unified atomic mass unit
|
u
|
1 u = 1.66054 × 10−27 kg
|
|
astronomical unit
|
ua
|
1 ua = 1.49598 × 1011 m
|
|
nautical mile
|
|
1 nautical mile = 1852 m
|
|
knot
|
|
1 knot = 1852/3600 m/s
|
|
are
|
a
|
1 a = 100 m2
|
|
hectare
|
ha
|
1 ha = 100 a = 104 m2
|
|
bar
|
bar
|
1 bar = 102 kPa = 105 Pa
|
|
angstrom
|
Å
|
1 Å = 0.1 nm = 10−10 m
|
|
curie
|
Ci
|
1 Ci = 3.7 × 1010 Bq
|
|
rad
|
rad
|
1 rad = 10−2 Gy
|
|
rem
|
rem
|
1 rem = 10−2 Sv
|
6. SI Prefixes
|
Factor
|
Name
|
Symb.
|
Factor
|
Name
|
Symb.
|
|
101
|
deca
|
da
|
10−1
|
deci
|
d
|
|
102
|
hecto
|
h
|
10−2
|
centi
|
c
|
|
103
|
kilo
|
k
|
10−3
|
milli
|
m
|
|
106
|
mega
|
