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REVISION
The common methods of expressing concentration are percentage, molarity, osmolarity and tonicity.
Percent concentration implies so many units of solute per 100 units of solution.
Molarity specifies the number of moles of solute per litre of solution.
Osmolarity specifies the molar concentration of all solute particles in solution.
Tonicity specifies the total concentration of all non-permeating solute particles in solution.