Chemistry / Unit 8 Chem 1573 short lesson, about 20 seconds
Osmosis and Osmotic Pressure
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The idea
Osmosis is solvent's net movement across a semipermeable membrane from lower to higher solute concentration; osmotic pressure would stop that movement.
In practice
A cell in pure water swells as water enters by osmosis, since its interior holds higher solute concentration.
Where people slip
A semipermeable membrane lets solvent cross both ways — osmosis is a net flow toward the more concentrated side, not a one-way gate.
Your place on the trail
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