- is a number between zero and one that describes the ease with which a solute permeates a membrane.
- If the reflection coefficient is one, the solute is impermeable. Therefore, it is retained in the original solution it creates an osmotic pressure, and it causes water flow.
- If the reflection coefficient is zero, the solute is completely permeable. Therefore, it will not exert any osmotic effect, and will not cause water flow.
- Serum albumin (a large solute) has a reflection coefficient of nearly one; urea (a small solute) has a reflection coefficient close to zero.
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