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  2. Fick's laws of diffusion - Wikipedia

    en.wikipedia.org/wiki/Fick's_laws_of_diffusion

    + represents 1/<d>, where d is the average distance between two molecules. This equation assumes the upper limit of a diffusive collision frequency between A and B is when the first neighbor layer starts to feel the evolution of the concentration gradient, whose reaction order is ⁠2 + 1 / 3 ⁠ instead of 2.

  3. Mean inter-particle distance - Wikipedia

    en.wikipedia.org/wiki/Mean_inter-particle_distance

    Mean inter-particle distance (or mean inter-particle separation) is the mean distance between microscopic particles (usually atoms or molecules) in a macroscopic body.

  4. Mean free path - Wikipedia

    en.wikipedia.org/wiki/Mean_free_path

    whose solution is known as Beer–Lambert law and has the form = /, where x is the distance traveled by the beam through the target, and I 0 is the beam intensity before it entered the target; ℓ is called the mean free path because it equals the mean distance traveled by a beam particle before being stopped.

  5. Diffusion - Wikipedia

    en.wikipedia.org/wiki/Diffusion

    Four terms in the formula for C 1 −C 2 describe four main effects in the diffusion of gases: ∇ ( n 1 n ) {\displaystyle \nabla \,\left({\frac {n_{1}}{n}}\right)} describes the flux of the first component from the areas with the high ratio n 1 / n to the areas with lower values of this ratio (and, analogously the flux of the second component ...

  6. Ideal gas law - Wikipedia

    en.wikipedia.org/wiki/Ideal_gas_law

    How much gas is present could be specified by giving the mass instead of the chemical amount of gas. Therefore, an alternative form of the ideal gas law may be useful. The chemical amount, n (in moles), is equal to total mass of the gas (m) (in kilograms) divided by the molar mass, M (in kilograms per mole): =.

  7. Displacement - Wikipedia

    en.wikipedia.org/wiki/Displacement

    Particle displacement, a measurement of distance of the movement of a particle in a medium as it transmits a wave (represented in mathematics by the lower-case Greek letter ξ) Displacement field (mechanics) , an assignment of displacement vectors for all points in a body that is displaced from one state to another

  8. Brownian motion - Wikipedia

    en.wikipedia.org/wiki/Brownian_motion

    The displacement of a particle undergoing Brownian motion is obtained by solving the diffusion equation under appropriate boundary conditions and finding the rms of the solution. This shows that the displacement varies as the square root of the time (not linearly), which explains why previous experimental results concerning the velocity of ...

  9. Potential gradient - Wikipedia

    en.wikipedia.org/wiki/Potential_gradient

    The simplest definition for a potential gradient F in one dimension is the following: [1] = = where ϕ(x) is some type of scalar potential and x is displacement (not distance) in the x direction, the subscripts label two different positions x 1, x 2, and potentials at those points, ϕ 1 = ϕ(x 1), ϕ 2 = ϕ(x 2).