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diffusion
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Three-panel diagram showing the diffusion of chloride and potassium ions across a semipermeable membrane. Panel A illustrates movement driven by a concentration gradient, panel B shows both concentration gradient and opposing electrostatic force, and panel C depicts equilibrium potential where forces balance and ion flow is stable. Chloride ions are marked in blue, potassium ions in red, with direction arrows indicating ion movement. Blue ink diffusing diffusing in water kept in three separate flasks. Diffusion of molecules across cellular membrane diffusion Two U-shaped tubes illustrate water diffusion across a semipermeable membrane. In diagram A, water moves from side 1 to side 2, driven by osmotic pressure and a concentration gradient, with impermeant substances unable to cross the membrane. In diagram B, hydrostatic pressure opposes the movement. Key concepts such as permeability, osmotic pressure, and impermeant membrane are labeled.
How Do Plants Absorb Water and Nutrients?
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How Do Plants Absorb Water and Nutrients?
Video showing how roots take up substances from the soil via osmosis, diffusion,...
Video: Encyclopædia Britannica, Inc.

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Ion movement across a semipermeable membrane
Diffusion of ions across a semipermeable membrane. (A) A high concentration of potassium...
Encyclopædia Britannica, Inc.
In diffusion, molecules move from regions of higher to lower concentration
This causes the molecules to be uniformly distributed in a medium.
© Science Photo Library/Getty Images
Diffusion of molecules across cellular membrane
Molecules move from regions of higher concentration toward regions of lower concentration.
© Katerynakon/Dreamstime.com
diffusion
Figure 10: Diffusive spread of a cloud of particles initially concentrated at a point....
Encyclopædia Britannica, Inc.
diffusion of water across a semipermeable membrane
(A) Water diffuses down its concentration gradient from side 1 to side 2 of a rigid...
Encyclopædia Britannica, Inc.
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