Osmosis, diffusion, filtration, and the movement of ions away from like charge all involve the movement of substances along certain gradients
Osmosis is the movement of solvent molecules from a region lower concentration to a region of higher concentration through a semi-permeable membrane.
Diffusion is the movement of molecules from region of higher concentration to region of lower concentration.
Filtration is the process of separating solid particles from liquid by the flow(motion) of the liquid substances through a separating medium called filter. This process is made possible because of difference in the pressures of the solid and liquid substances
Movement of ions away from like charges is as a result of difference in the electrical potentials between the charges
From the definitions above:
osmosis and diffusion involve movement of substances along a concentration gradient
Filtration involves the movement of substances along pressure gradient
Ionic movement describes the movement along an electrical gradient.
All of the processes mentioned (diffusion, filtration, and the movement of ions away from like charge) involve the movement of substances along certain gradients
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