Si Units Reference Table
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1Table of SI units
Table-A. SI base units
SI prefixes
Non-SI units
Non-SI units
Name
SI units
Factor Name Symbol
accepted for use with the SI
accepted in Japanese Measurement ACT
24
length
m (metre)
ua (astronomical unit)
yotta
Z
10
t (tonne), Da (dalton),
21
zetta
Y
10
mass
kg (kilogram)
18
u (unified atomic mass unit)
exa
E
10
15
time
s (second)
min (minute), h (hour), d (day)
peta
P
10
12
electric
A (ampere)
tera
T
10
9
thermodynamic temperature
K (kelvin)
giga
G
10
6
amount of substance
mol (mole)
mega
M
10
3
luminous intensity
cd (candela)
kilo
k
10
2
hecto
h
10
Table-B. Examples of coherent derived units in the SI expressed in terms of base units
10
deca
da
Non-SI units
Non-SI units
1
Name
SI units
-1
accepted for use with the SI
accepted in Japanese Measurement ACT
deci
d
10
2
-2
area
ha (hectare)
centi
c
m
(metre)
10
3
-3
volume
l, L (litre)
milli
m
m
(cubic metre)
10
-6
speed, velocity
m/s (metre per second)
micro
μ
10
2
-9
acceleration
nano
n
m/s
(metre per second squared)
10
-1
-12
wavenumber
pico
p
m
(reciprocal metre)
10
3
-15
density, mass density
femto
f
kg/m
(kilogram per cubic metre)
10
2
-18
surface density
atto
a
kg/m
(kilogram per square metre)
10
3
-21
specific volume
zepto
z
m
/kg (cubic metre per kilogram)
10
2
-24
current density
yocto
y
A/m
(ampere per square metre)
10
magnetic field strength
A/m (ampere per metre)
3
amount concentration, concentration
%、vol%(volume parts per cent), *1)
mol/m
(mole per cubic metre)
3
mass concentration
%、wt%(weight parts per cent), *1)
kg/m
(kilogram per cubic metre)
2
luminance
cd/m
(candela per square metre)
refractive index
1 (one)
relative permeability
1 (one)
*1) ‰(parts per thouzand), ppm(parts per million), ppb(parts per billion), ppt(parts per trillion), ppq(parts per quadrollion)
Table-C. Coherent derived units in the SI with special names and special names and symbols
Expressed in terms of
Non-SI units
Non-SI units
Name
SI units
other SI units
accepted for use with the SI
accepted in Japanese Measurement ACT
o
plane angle
rad (radian)
1
(degree), ' (minute), " (second)
solid angle
sr (steradian)
1
frequency
Hz (hertz)
rpm(revolution per minute),
force
N (newton)
2
pressure, stress
Pa (pascal)
atm(atmosphere）, Torr(torr)
N/m
energy, work, amount of heat
J (joule)
N m
eV (electronvolt)
power, radiant flux
W (watt)
J/s
var(var), VA(volt ampere)
electric charge, amount of electricity
C (coulomb)
electric potential difference,
V (volt)
W/A
electromotive force
capacitance
F (farad)
C/V
electric resistance
Ω (ohm)
V/A
electric conductance
S (siemens)
A/V
magnetic flux
Wb (weber)
V s
2
magnetic flux density
T (tesla)
Wb/m
inductance
H (henry)
Wb/A
o
Celsius temperature
C (degree Celsius)
luminous flux
lm (lumen)
cd sr
2
illuminance
lx (lux)
lm/m
activity referred to a radionuclide
Bq (becquerel)
absorbed dose, specific energy (imparted),
Gy (gray)
J/kg
kerma
dose equivalent, ambient dose equivalent,
directional dose equivalent,
Sv (sievert)
J/kg
personal dose equivalent
catalytic activity
kat (katal)
Table-D. Examples of SI coherent derived units whose names
and symbols include SI coherent derived units with special names and symbols
Non-SI units
Non-SI units
Name
SI units
accepted for use with the SI
accepted in Japanese Measurement ACT
dynamic viscosity
Pa s (pascal second)
P(poise)
moment of force
N m (newton metre)
surface tension
N/m (newton per metre)
angular velocity
rad/s (radian per second)
2
angular acceleration
rad/s
(radian per second squared)
2
heat flux density, irradiance
W/m
(watt per square metre)
heat capacity, entropy
J/K (joule per kelvin)
specific heat capacity, specific entropy
J/(kg K) (joule per kilogram kelvin)
specific energy
J/kg (joule per kilogram)
thermal conductivity
W/(m K) (watt per metre kelvin)
3
energy density
J/m
(joule per cubic metre)
electric field strength
V/m (volt per metre)
3
electric charge density
C/m
(coulomb per cubic metre)
2
surface charge density
C/m
(coulomb per square metre)
2
electric flux density, electric displacement C/m
(coulomb per square metre)
permittivity
F/m (farad per metre)
permeability
H/m (henry per metre)
molar energy
J/mol (joule per mole J/mol)
molar entropy, molar heat capacity
J/(mol K) (joule per mole kelvin)
exposure (x- and γ-rays)
C/kg (coulomb per kilogram)
absorbed dose rate
Gy/s (gray per second)
radiant intensity
W/sr (watt per steradian)
2
radiance
W/(m
sr) (watt per square metre steradian)
3
catalytic activity concentration
kat/m
(katal per cubic metre)
Table-E. Others
Non-SI units
Non-SI units
Name
SI units
accepted for use with the SI
accepted in Japanese Measurement ACT
kinematic viscosity
St(stokes）
logarithmic ratio quantities
dB(decibel）
potential Hydrogen
pH(ph)
For detail, refer to "SI brochure -8th Edition-" at the BIPM website ( ).
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