What's the difference between osmolarity and osmolality?


Question:
(in human blood samples)
Answers:
Osmolality: The concentration of particles dissolved in a fluid. The osmolality of serum can help diagnose several medical conditions such as dehydration, diabetes, and shock.

Osmolarity: regarding people with DI, osmolarity is the direct measurement of the concentration of dissolved substances in urine. In general, osmolarity is the concentration of an osmotic solution especially when measured in osmols or milliosmols per liter of solution.

there ya go :)

Other Answers:
In human blood samples, for all practical purposes there is no difference. In chemical terms, osmolarity measures the amount of osmotically active material (in moles) dissolved per liter of solvent, and osmolality measures it per kilogram of solvent. In relatively dilute aqueous solutions, there's very little difference.



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