Reverse Osmosis – What is Osmosis – Page 1
Osmosis is the passage of water or a solution from a region of low water / solution concentration through a membrane (semi permeable) to a region of high water / solution concentration.
Osmosis is a natural affect. Semi permeable membranes are membranes that will allow some things to pass through but not others.
The osmosis effect can be found in many places such as blood cells or plant leaves.
Osmotic equilibrium is reached when sufficient water has passed across the membrane to equalise the solute concentration on both sides of the membrane.
Whilst talking about Osmosis it is worth explaining the terminology used for the solutions.
The solutions all come under three types:
Type A = Isotronic
This means the solutions being compared have an equal concentration of solutes
Type B = Hypertronic
This refers to the solution with the higher concentration of solutions. Usually on the inlet side of the membrane.
Type C = Hypotronic
This refers to the solution with the lower concentration of solutes. Usually on the outlet side of the membrane.
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