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What is Diffusion??


Desiree Stroud

on 9 October 2012

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Transcript of What is Diffusion??

Diffusion By Desiree Stroud
Pd.9 Biology What is Diffusion? Diffusion is the movement
of particles from highly
concentrated areas... To a less concentrated region when a system is at equilibrium, when action isn't occurring. 2 Types of
Diffusion Simple Diffusion Facilitated
Diffusion Passive
Transportation occurs when a molecule passes through a lipid bilayer Process used for molecules
that cannot readily
diffuse through cell
membranes because such molecules are
too large to pass through Depends on carrier proteins as a means of transportation Does not involve a protein You can witness Diffusion
taking place in
your everyday life. Diffusion can occur... by placing a drop of blue dye into a
glass of water... ...and when
a febreeze
bottle is
sprayed Did you know that diffusion is vital for life on earth? It keeps our air mixture constant... ...and it keeps living
organism's bodies
functioning correctly. Did you know that without diffusion, our eyes would dry out and many medicines would not be able to absorb into our bodies? The Discovery Thomas Graham, a highly awarded chemist, first developed
and interest in spontaneous gasses when he was 21. He wrote papers on gaseous diffusion and these papers
became Graham's Law. Graham's Law- the rate of diffusion
of a gas through porous membranes
varies with the square root of its density. Bibliography http://www.encyclopedia.com/topic/Thomas_Graham.aspx

“On the Law of the Diffusion of Gases,” in Philosophical Magazine, 2 (1833).



http://biology.arizona.edu/sciconn/lessons/mccandless/reading.html D i d Y O U K n o w
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