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Terms in this set (3)
It is the movement of water molecules across a partially permeable membrane from a region of higher water concentration to a region of lower water concentration.
Partially permeable membrane?
A membrane with very small holes in it; only tiny molecules can pass through them and bigger molecules can't.
Why can water molecules pass both ways through the membrane during osmosis?
1. Because the water molecules move about randomly all the time.
2. But because there are more water molecules on one side than the other, there is a steady net flow of water into the region with fewer water molecules.
3. This means that the strong sugar solution gets more dilute; the water acts like it is trying to 'even up' the concentration either side of the membrane.
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