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What is osmosis
Osmosis is the movement of water molecules from a region of higher water potential to a region of lower water potential through a partially permeable membrane.

What has the highest possible water potential
pure water, its water potential is 0 kPa, its because it has highest possible concentration of water molecules.

What is water potential
The pressure exertted by water molecules as they collide with a membrane / container
All solutions have negative water potentials, pure water has water potential of 0kPa
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