BRAINCAKEWater Potential Φ
The water potential Ψ is the pressure created by water molecules.
Under standard conditions of temperature and pressure (25°C, 100kPa), pure water has a water potential of zero.
The addition of a solute to pure water lowers the water potential i.e. makes it more negative.
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Key terms in this lesson
- osmosis
- The net movement of water molecules from a region of higher water potential to a region of lower water potential through a selectively permeable membrane.
More in Transport Across Cell Membranes
- Simple Diffusion
- Facilitated Diffusion
- Protein Channels
- Carrier Proteins
- Osmosis
- Osmosis in Animal Cells
- Osmosis in Plant Cells
- Active Transport
All 22 lessons in Transport Across Cell Membranes · All AQA AS-level Biology topics