diffusion پخش paxš (#) Fr.: diffusion Movement of a gas or liquid as a result of the random thermal motion
of its atoms or molecules.
The random spreading out of a beam of radiation on reflection
(→ diffuse reflection) or transmission through a
translucent medium (such as amber, milk, or frosted glass).
In chemical thermodynamics, the process of attaining an equilibrium
distribution of the → concentration within the phases.
A result of diffusion at constant equilibrium is the equalization of the
→ chemical potentials.
Related terms:
→ diffraction;
→ dispersion;
→ distribution;
→ scatter;
→ scattering.
Etymology (EN): L. diffusionem, from stem of diffundere “scatter, pour out,”
from dif- “apart, in every direction,” → dis-, - fundere “to melt, cast, pour out,” from PIE
*gheud-, from root *gheu- “to pour.”
Etymology (PE): Paxš, verbal noun and stem of paxšidan→ diffuse. |
