Einstein–Smoluchowski relation

E4990

The Einstein–Smoluchowski relation is a fundamental equation in statistical physics that links the diffusion coefficient of particles undergoing Brownian motion to their mobility and thermal energy.

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Predicate Object
instanceOf equation in statistical physics
physical law
appliesTo Brownian particles in thermal equilibrium
assumes isothermal conditions
linear response regime
overdamped dynamics
category Brownian dynamics
Equations of statistical mechanics
Transport phenomena
connects diffusion and drift under external force
random thermal motion and dissipative transport
describes Brownian motion of particles in a fluid
relation between diffusion coefficient and mobility
expresses D = μ k_B T
field soft condensed matter physics
statistical physics
thermodynamics
involvesQuantity Boltzmann constant
surface form: Boltzmann constant k_B

absolute temperature T
diffusion coefficient D
mobility μ
isSpecialCaseOf fluctuation–dissipation theorem
namedAfter Albert Einstein
Marian Smoluchowski
relatedConcept Brownian motion
Fokker–Planck equation
Langevin dynamics
surface form: Langevin equation

Stokes–Einstein relation
diffusion equation
mobility (transport theory)
relates diffusion coefficient
particle mobility
thermal energy
usedIn biophysics
colloid science
electrolyte theory
microrheology
single-particle tracking analysis
soft matter physics
transport phenomena
validFor non-interacting or weakly interacting particles
systems near thermal equilibrium
yearProposed 1905

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Referenced by (2)

Full triples — surface form annotated when it differs from this entity's canonical label.

Brownian motion usedIn Einstein–Smoluchowski relation
On the Motion of Small Particles Suspended in Liquids at Rest Required by the Molecular-Kinetic Theory of Heat relatedConcept Einstein–Smoluchowski relation
this entity surface form: Einstein relation for diffusion