CHEMISTRY: Diffusion is movement of
molecules,
atoms or
ions of
liquids and
gases from their region of higher
concentration to their region of lower concentration until it is
same throughout the given space.
In general the diffusion is the passage of
particles through a material from an area of high concentration to
a region of low concentration resulting in an even distribution
particles. The phenomenon is readily observed when a drop of
coloured water is added to clear water, or when smoke from a
chimney dissipates into the air. In these cases, diffusion is the
result of turbulent fluid motion rather than chemical reactions or
the application of external force.
For example: When perfume is spilt in one corner of a room its fragrance
spreads all over the room.
PHYSICS: Diffusion is the spreading of
radiation,
heat, or sound across a
fluid or
solid medium in a direction
tending to equalize
concentrations in all parts of the system. For example: Scattering of
light rays trough a frosted glass or a
translucent body or
membrane.
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