Derived
quantity
|
Symbol
|
Description
|
SI units
|
Plane angle
|
θ
|
Measure of a change in direction or orientation.
|
radian (rad)
|
Solid angle
|
Ω
|
Measure of the size of an object as projected on a sphere.
|
steradian (sr)
|
Absorbed dose rate
|
|
Absorbed dose received per unit of time.
|
Gy s−1
|
Acceleration
|
a
|
Rate of change of the speed or velocity of an object.
|
m s−2
|
Angular acceleration
|
α
|
Rate of change in angular speed or velocity.
|
rad s−2
|
Angular speed (or angular velocity)
|
ω or ω
|
The angle incremented in a plane by a segment connecting
an object and a reference point.
|
rad s−1
|
Angular momentum
|
L
|
Measure of the extent and direction and object rotates
about a reference point.
|
kg m2 s−1
|
Area
|
A
|
The two dimensional extent of an object.
|
m2
|
Area density
|
ρA
|
The amount of mass per unit area of a two dimensional
object.
|
kg m−2
|
Capacitance
|
C
|
Measure for the amount of stored charge for a given
potential.
|
farad (F = A2 s4 kg−1 m−2)
|
Catalytic activity
|
|
Change in reaction rate due to presence of a catalyst.
|
katal (kat = mol s−1)
|
Catalytic activity concentration
|
|
Change in reaction rate due to presence of a catalyst per
unit volume of the system.
|
kat m−3
|
Chemical potential
|
μ
|
The amount of energy needed to add a particle to a system.
|
J mol−1
|
Molar concentration
|
C
|
Amount of substance per unit volume.
|
mol m−3
|
Current density
|
J
|
Amount of electric current flowing through a surface.
|
A m−2
|
Dose equivalent
|
H
|
Measure for the received amount of radiation adjusted for
the effect of different types of radiant on biological tissue.
|
sievert (Sv = m2 s−2)
|
Dynamic Viscosity
|
η
|
Measure for the resistance of an incompressible fluid to
stress.
|
Pa s
|
Electric Charge
|
Q
|
Amount of electric charge.
|
coulomb (C = A s)
|
Electric charge density
|
ρQ
|
Amount of electric charge per unit volume.
|
C m−3
|
Electric displacement
|
D
|
Strength of the electric displacement.
|
C m−2
|
Electric field strength
|
E
|
Strength of the electric field.
|
V m−1
|
Electrical conductance
|
G
|
Meausure for how easily current flows through a material.
|
siemens (S = A2 s3 kg−1 m−2)
|
Electric potential
|
V
|
The amount of work required to bring a unit charge into an
electric field from infinity.
|
volt (V = kg m2 A−1 s−3)
|
Electrical resistance
|
R
|
The degree to which an object opposes the passage of an
electric current.
|
ohm (Ω = kg m2 A−2 s−3)
|
Energy
|
E
|
The capacity of a body or system to do work.
|
joule (J = kg m2 s−2)
|
Energy density
|
ρE
|
Amount of energy per unit volume.
|
J m−3
|
Entropy
|
S
|
Measure for the amount of available states for a system.
|
J K−1
|
Force
|
F
|
The cause of acceleration, acting on an object.
|
newton (N = kg m s−2)
|
Impulse
|
p
|
The cause of a change in momentum, acting on an object.
|
kg m s−1
|
Frequency
|
f
|
The number of times something happens in a period of time.
|
hertz (Hz =s−1)
|
Half-life
|
t1/2
|
The time needed for a quantity to decay to half its
original value.
|
s
|
Heat
|
Q
|
Amount of energy transferred between systems due to
temperature difference.
|
J
|
Heat capacity
|
Cp
|
Amount of energy needed to raise the temperature of a
system by one degree.
|
J K−1
|
Heat flux density
|
ϕQ
|
Amount of heat flowing through a surface per unit area.
|
W m−2
|
Illuminance
|
Ev
|
Total luminous flux incident to a surface per unit area.
|
lux (lx = cd sr m−2)
|
Impedance
|
Z
|
Measure for the resistance of an electrical circuit
against an alternating current.
|
ohm (Ω = kg m2 A−2 s−3)
|
Index of refraction
|
n
|
The factor by which the speed of light is reduce in a
medium.
|
|
Inductance
|
L
|
Measure for the amount of magnetic flux generated for a
certain current run through a circuit.
|
henry (H = kg m2 A−2 s−2)
|
Irradiance
|
E
|
Power of electromagnetic radiation flowing through a
surface per unit area.
|
W m−2
|
Linear density
|
ρl
|
Amount of mass per unit length of a one dimensional
object.
|
|
Luminous flux (or luminous power)
|
F
|
Perceived power of a light source.
|
lumen (lm = cd sr)
|
Magnetic field strength
|
H
|
Strength of a magnetic field in a material.
|
A m−1
|
Magnetic flux
|
Φ
|
Measure of quantity of magnetism, taking account of the
strength and the extent of a magnetic field.
|
weber (Wb = kg m2 A−1 s−2)
|
Magnetic flux density
|
B
|
Measure for the strength of the magnetic field.
|
tesla (T = kg A−1 s−2)
|
Magnetization
|
M
|
Amount of magnetic moment per unit volume.
|
A m−1
|
Mass fraction
|
x
|
Mass of a substance as a fraction of the total mass.
|
kg/kg
|
(Mass) Density (volume density)
|
ρ
|
The amount of mass per unit volume of a three dimensional
object.
|
kg m−3
|
Mean lifetime
|
τ
|
Average time needed for a particle to decay.
|
s
|
Molar energy
|
|
Amount of energy present is a system per unit amount of
substance.
|
J mol−1
|
Molar entropy
|
|
Amount of entropy present in a system per unit amount of
substance.
|
J K−1 mol−1
|
Molar heat capacity
|
c
|
Heat capacity of a material per unit amount of substance.
|
J K−1 mol−1
|
Moment of inertia
|
I
|
Inertia of an object with respect to angular acceleration.
|
kg m2
|
Momentum
|
p
|
Product of an object's mass and velocity.
|
N s
|
Permeability
|
μ
|
Measure for how the magnetization of material is affected
by the application of an external magnetic field.
|
H m−1
|
Permittivity
|
ε
|
Measure for how the polarization of a material is affected
by the application of an external electric field.
|
F m−1
|
Power
|
P
|
The rate of change in energy over time.
|
watt (W)
|
Pressure
|
p
|
Amount of force per unit area.
|
pascal (Pa = kg m−1 s−2)
|
(Radioactive) Activity
|
A
|
Number of particles decaying per unit time.
|
becquerel (Bq = s−1)
|
(Radioactive) Dose
|
D
|
Amount of energy absorbed by biological tissue from
ionizing radiation per unit mass.
|
gray (unit) (Gy = m2 s−2)
|
Radiance
|
L
|
Power of emitted electromagnetic radiation per solid angle
and per projected source area.
|
W m−2 sr−1
|
Radiant intensity
|
I
|
Power of emitted electromagnetic radiation per solid
angle.
|
W sr−1
|
Reaction rate
|
r
|
Measure for speed of a chemical reaction.
|
mol m−3 s−1
|
Speed
|
v
|
Rate of change of the position of an object.
|
m s−1
|
Specific energy
|
|
Amount of energy present per unit mass.
|
J kg−1
|
Specific heat capacity
|
c
|
Heat capacity per unit mass.
|
J kg−1 K−1
|
Specific volume
|
v
|
The volume occupied by a unit mass of material (reciprocal
of density).
|
m3 kg−1
|
Spin
|
S
|
Intrinsic property of particles, roughly to be interpreted
as the intrinsic angular momentum of the particle.
|
kg m2 s−1
|
Stress
|
σ
|
Amount of force exerted per surface area.
|
Pa
|
Surface tension
|
γ
|
Amount of work needed to change the surface of a liquid by
a unit surface area.
|
N m−1 or J m−2
|
Thermal conductivity
|
k
|
Measure for the ease with which a material conducts heat.
|
W m−1 K−1
|
Torque (moment of force)
|
τ
|
Product of a force and the perpendicular distance of the
force from the point about which it is exerted.
|
N m
|
Velocity
|
v
|
Speed of an object in a chosen direction.
|
m s−1
|
Volume
|
V
|
The three dimensional extent of an object.
|
m3
|
Wavelength
|
λ
|
Distance between repeating units of a propagating wave.
|
m
|
Wavenumber
|
k
|
Reciprocal of the wavelength.
|
m−1
|
Weight
|
w
|
Amount of gravitation force exerted on an object.
|
newton (N = kg m s−2)
|
Work
|
W
|
Energy dissipated by a force moving over a distance,
scalar product of the force and the movement vector.
|
joule (J = kg m2 s−2)
|
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Monday, December 4, 2017
Name and Symbols of Different Physical Terms, Descriptions and SI Units
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