Base
Quantities
Base
quantity
|
Symbol
|
SI unit
|
Symbol/
dimension
|
Length
|
l
|
metre (m)
|
L
|
Mass
|
m
|
kilogram (kg)
|
M
|
Time
|
t
|
second (s)
|
T
|
Electric
current
|
I
|
ampere (A)
|
I
|
Temperature
|
T
|
kelvin (K)
|
Θ
|
Amount of substance
|
n
|
mole (mol)
|
N
|
Luminous intensity
|
L
|
candela (cd)
|
J
|
Derived Quantities
Derived quantity
|
Symbol
|
SI units
|
Dimension
|
Plane angle
|
θ
|
radian (rad)
|
1
|
Solid angle
|
Ω
|
steradian (sr)
|
1
|
Absorbed dose rate
|
Gy s−1
|
L2 T−3
|
|
Acceleration
|
a→
|
m s−2
|
L T−2
|
Angular acceleration
|
α
|
rad s−2
|
T−2
|
Angular speed (orangular
velocity)
|
ω
|
rad s−1
|
T−1
|
Angular momentum
|
L
|
kg m2 s−1
|
M L2 T−1
|
Area
|
A
|
m2
|
L2
|
Area density
|
ρA
|
kg m−2
|
M L−2
|
Capacitance
|
C
|
farad (F = A2 s4 kg−1m−2)
|
I2 T4 M−1 L−2
|
Catalytic activity
|
katal (kat = mol s−1)
|
N T−1
|
|
Catalytic activity concentration
|
kat m−3
|
N L−3 T−1
|
|
Chemical potential
|
μ
|
J mol−1
|
M L2 T−2 N−1
|
Molar concentration
|
C
|
mol m−3
|
N L−3
|
Crackle
|
c→
|
m s-5
|
L T-5
|
Current density
|
J →
|
A m−2
|
I L−2
|
Dose equivalent
|
H
|
sievert (Sv = m2 s−2)
|
L2 T−2
|
Dynamic Viscosity
|
η
|
Pa s
|
M L−1 T−1
|
Electric Charge
|
Q
|
coulomb (C = A s)
|
I T
|
Electric charge density
|
ρQ
|
C m−3
|
I T L−3
|
Electric displacement
|
D
|
C m−2
|
I T L−2
|
Electric field strength
|
E→
|
V m−1
|
M L T−3 I−1
|
Electrical conductance
|
G
|
siemens (S = A2 s3 kg−1 m−2)
|
L−2 M−1 T3 I2
|
Electric potential
|
V
|
volt (V = kg m2 A−1 s−3)
|
L2 M T−3 I−1
|
Electrical resistance
|
R
|
ohm (Ω = kg m2 A−2 s−3)
|
L2 M T−3 I−2
|
Energy
|
E
|
joule (J = kg m2 s−2)
|
M L2 T−2
|
Energy density
|
ρE
|
J m−3
|
M L−1 T−2
|
Entropy
|
S
|
J K−1
|
M L2 T−2 Θ−1
|
Force
|
F→
|
newton (N = kg m s−2)
|
M L T−2
|
Fuel efficiency
|
mpg
|
fuel efficiency (mpg = m m−3
|
M M−3
|
Impulse
|
p→
|
kg m s−1
|
M L T−1
|
Frequency
|
f
|
hertz (Hz =s−1)
|
T−1
|
Half-life
|
t1/2
|
s
|
T
|
Heat
|
Q
|
J
|
M L2 T−2
|
Heat capacity
|
Cp
|
J K−1
|
M L2 T−2 Θ−1
|
Heat flux density
|
ϕQ
|
W m−2
|
M T−3
|
Illuminance
|
Ev
|
lux (lx
= cd sr m−2)
|
J L−2
|
Impedance
|
Z
|
ohm (Ω = kg m2 A−2 s−3)
|
L2 M T−3 I−2
|
Index of refraction
|
n
|
1
|
|
Inductance
|
L
|
henry (H = kg m2 A−2s−2)
|
M L2 T−2 I−2
|
Irradiance
|
E
|
W m−2
|
M T−2
|
Intensity
|
I
|
W m−2
|
M T−2#
|
Jerk
|
j→
|
m s-3
|
L T-3
|
Jounce
|
s→
|
m s-4
|
L T-4
|
Linear density
|
ρl
|
M L−1
|
|
Luminous flux (orluminous power)
|
F
|
lumen (lm = cd sr)
|
J
|
Mach Number (ormach)
|
M
|
Unitless (M = u/c)
|
1
|
Magnetic field strength
|
H
|
A m−1
|
I L−1
|
Magnetic flux
|
Φ
|
weber (Wb = kg m2 A−1 s−2)
|
M L2 T−2 I−1
|
Magnetic flux density
|
B
|
tesla (T = kg A−1 s−2)
|
M T−2 I−1
|
Magnetization
|
M
|
A m−1
|
I L−1
|
Mass fraction
|
x
|
kg/kg
|
1
|
(Mass) Density(volume density)
|
ρ
|
kg m−3
|
M L−3
|
Mean lifetime
|
τ
|
s
|
T
|
Molar energy
|
J mol−1
|
M L2 T−2 N−1
|
|
Molar entropy
|
J K−1 mol−1
|
M L2 T−2 Θ−1 N−1
|
|
Molar heat capacity
|
c
|
J K−1 mol−1
|
M L2 T−2 N−1
|
Moment of inertia
|
I
|
kg m2
|
M L2
|
Momentum
|
p→
|
N s
|
M L T−1
|
Permeability
|
μ
|
H m−1
|
M L T−2 I−2
|
Permittivity
|
ε
|
F m−1
|
I2 M−1 L−3 T4
|
Power
|
P
|
watt (W)
|
M L2 T−3
|
Pressure
|
p
|
pascal (Pa = kg m−1 s−2)
|
M L−1 T−2
|
Pop
|
p→
|
m s-6
|
L T-6
|
(Radioactive) Activity
|
A
|
becquerel (Bq = s−1)
|
T−1
|
(Radioactive) Dose
|
D
|
gray (unit) (Gy = m2 s−2)
|
L2 T−2
|
Radiance
|
L
|
W m−2 sr−1
|
M T−3
|
Radiant intensity
|
I
|
W sr−1
|
M L2 T−3
|
Reaction rate
|
r
|
mol m−3 s−1
|
N L−3 T−1
|
Speed
|
v
|
m s−1
|
L T−1
|
Specific energy
|
J kg−1
|
L2 T−2
|
|
Specific heat capacity
|
c
|
J kg−1 K−1
|
L2 T−2 Θ−1
|
Specific volume
|
v
|
m3 kg−1
|
L3 M−1
|
Spin
|
S
|
kg m2 s−1
|
M L2 T−1
|
Strain
|
Unitless
|
Dimensionless
|
|
Stress
|
σ
|
Pa
|
M L−1 T−2
|
Surface tension
|
γ
|
N m−1 or J m−2
|
M T−2
|
Thermal conductivity
|
k
|
W m−1 K−1
|
M L T−3 Θ−1
|
Torque
|
τ
|
N m
|
M L2 T−2
|
Velocity
|
v→
|
m s−1
|
L T−1
|
Volume
|
V
|
m3
|
L3
|
Wavelength
|
λ
|
m
|
L
|
Wavenumber
|
k
|
m−1
|
L−1
|
Weight
|
w
|
newton (N = kg m s−2)
|
M L T−2
|
Work
|
W
|
joule (J = kg m2 s−2)
|
M L2 T−2
|
Young's
modulus
|
pascal (Pa = kg m−1 s−2)
|
M L−1 T−2
|
