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osmotic pressure
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diffusion of water across a semipermeable membrane Figure 4: Osmotic pressure π caused by a membrane that allows A to pass but not B. A representative system could consist of water (A) and salt (B).
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diffusion of water across a semipermeable membrane
Figure 4: Osmotic pressure π caused by a membrane that allows A to pass but not B. A representative system could consist of water (A) and salt (B).
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Key People

Jacobus Henricus van't Hoff, detail of an oil painting by Helene Büchmann.
Jacobus Henricus van ’t Hoff
Dutch chemist