Diffusion occurs from a region of Brownian motiondistanceFick’shighlipidslowmass and lipid solubilitypassivepermeabilitysizesurface areatemperatureviscosity concentration to a region of Brownian motiondistanceFick’shighlipidslowmass and lipid solubilitypassivepermeabilitysizesurface areatemperatureviscosity concentration. The primary factor driving this Brownian motiondistanceFick’shighlipidslowmass and lipid solubilitypassivepermeabilitysizesurface areatemperatureviscosity process comes from the kinetic energy of Brownian motiondistanceFick’shighlipidslowmass and lipid solubilitypassivepermeabilitysizesurface areatemperatureviscosity, the random process of movement imparted by increasing Brownian motiondistanceFick’shighlipidslowmass and lipid solubilitypassivepermeabilitysizesurface areatemperatureviscosity.

Diffusion is good for rapid movement over short distances because the time taken to diffuse increases with the square of the Brownian motiondistanceFick’shighlipidslowmass and lipid solubilitypassivepermeabilitysizesurface areatemperatureviscosity.

With respect to the medium through which the particle is diffusing, two factors needing consideration are the total Brownian motiondistanceFick’shighlipidslowmass and lipid solubilitypassivepermeabilitysizesurface areatemperatureviscosity available for the particle to diffuse across, and the thickness of the medium, or more correctly, the Brownian motiondistanceFick’shighlipidslowmass and lipid solubilitypassivepermeabilitysizesurface areatemperatureviscosity of the medium.

One factor related to the particle under consideration, independent of whether the area through which the particle is diffusing is a cell membrane or a fluid or a gas medium is the Brownian motiondistanceFick’shighlipidslowmass and lipid solubilitypassivepermeabilitysizesurface areatemperatureviscosity of the particle.

Another particle-related factor which is relevant only if considering the diffusion of the particle through a cell membrane is the solubility of the particle in Brownian motiondistanceFick’shighlipidslowmass and lipid solubilitypassivepermeabilitysizesurface areatemperatureviscosity.

For any particular molecule trying to traverse a specific membrane at a particular temperature, a number of these factors are fixed as the Brownian motiondistanceFick’shighlipidslowmass and lipid solubilitypassivepermeabilitysizesurface areatemperatureviscosity constant.

To calculate the net flux of a solute across a membrane at any particular tempearture, we can use an equation known as Brownian motiondistanceFick’shighlipidslowmass and lipid solubilitypassivepermeabilitysizesurface areatemperatureviscosity Law.

This law tells us that if we are considering a specific cell membrane at a given temperature, then we can compare the the relative permeability of the membrane to different molecules bu using the molecule-specific properties of Brownian motiondistanceFick’shighlipidslowmass and lipid solubilitypassivepermeabilitysizesurface areatemperatureviscosity.