Molecular and related quantities
Mechanical and related quantities
Thermodynamic and related quantities
Chemical reactions
Light
Electricity and magnetism
Electrochemistry
Space, time, mass, and related quantities
height h
radius r
diameter d
path, length of arc s
plane angle
,
,
,
,
,
solid angle
area A,S
volume V...
specific volume
wavelength
wavenumber
,
time t
period or other characteristic interval T,
frequency
,f
angular frequency (2
)
velocity
... u,w
angular velocity
acceleration a
acceleration of free fall g
mass m
moment of inertia I
density p
relative density d
Molecular and related quantities
molar mass M
Avogadro's number N0,L,N
number of molecules N
number of moles n
mole fraction x...X,y
molality m
concentration c
molar concentration of substance B cB,[B], c(B)
molecular concentration C
partition function Q
statistical weight g...p
symmetry number
characteristic temperature
diameter of molecule
...D
mean free path l
diffusion coefficient D
osmotic pressure
surface concentration
Mechanical and related quantities
force due to gravity (weight) G...W
moment of force M
power P
pressure p, P
traction
shear stress
modulus of elasticity E
shear modulus G
compressibility
compression modulus (1/
) K
viscosity
fluidity
kinematic viscosity
friction coefficient f
surface tension
...
angle of contact
Thermodynamic and related quantities
...t
temperature, absolute T
gas constant R
Boltzmann constant k
heat q,Q
work w,A
energy (Gibbs
) E...U
entropy (Gibbs
) S
*Helmholtz free energy (Gibbs
) A
enthalpy (Gibbs
) H
*Gibbs function (
) G...F
heat capacity C
specific heat at constant pressure cp
specific heat at constant volume cv
ratio of specific heats cp/cv,
,
chemical potential µ
activity, absolute
activity, relative a
activity coefficient f,
osmotic coefficient g,
thermal conductivity
Joule-Thomson coefficient µ
Chemical reactions
standard equation of chemical reaction
BB = 0
affinity (-
BµB) of a reaction A
equilibrium constant K
equilibrium quotient or equilibrium product (of molalities) Q
extent of reaction (dnB = vBd
)
degree of reaction (e.g., degree of dissociation)
rate constant k
collision number (collisions per unit volume and unit time) Z
rate constant corresponding to the rate Z z
rate of reaction
...r,s,J
Light
Planck's constant divided by 2
h
quantity of light Q
radiant power, flux of light (dQ/dt)
luminous intensity (d
/d) I
illumination (d
/dS) E
luminance L,B
luminous emittance H
absorption factor (fraction of incident radiant power which is absorbed)
reflection factor (fraction of incident radiant power which is reflected)
transmission factor (fraction of incident radiant power which is transmitted)
transmittance (T = I/I0) T
absorption (extinction) coefficient [
/c = ln (1/T)]
absorbance (extinction) [A = log (1/T)] A...E
absorptivity (specific absorbance) [decadic absorption or extinction coefficient] a
molar absorptivity (molar decadic absorption or extinction coefficient) [
/c = A]
refraction index n
refractivity r
angle of optical rotation
Electricity and magnetism
quantity of electricity Q
charge density
surface charge density
electric current I...i
electric current density J
electric potential V
electric field strength E
electric displacement D
electrokinetic potential
capacitance C
permittivity (dielectric constant)
dielectric polarization P
dipole moment µ
electric polarizability of a molecule
,
magnetic field strength H
magnetic induction B
magnetic permeability µ
magnetization M
magnetic susceptibility
resistance R
resistivity
mutual inductance M,L12
self inductance L
reactance X
impedance Z
admittance Y
Electrochemistry
charge number of an ion, plus or minus z
degree of electrolytic dissociation
ionic strength I...µ
electrolytic conductivity (specific conductance)
equivalent or molar conductance of electrolyte or ion A
transport number t,T
electromotive force E
overpotential
| *The terms for the Helmholtz and Gibbs energies were modified by action of the IUPAC Council, Montreal, August 1961, as follows: Helmholtz energy (Gibbs = E-TS):A Gibbs energy (Gibbs = H-TS):G |