Before going to osmolality or osmolarity, lets get the definition of molality & molarity.
High school physics - Mole is a SI unit for amount of substance i.e quantity. The no. of atoms in one mole is Avagadro's consatant and we dont need that here!!
MOLALITY - no. of moles per kg of a solution (mol /kg)
MOLARITY - no. of moles per litre of a solution (mol/L)
So if we apply this ..... Osmolality is no. of osmoles /kg, and Osmolarity is no. of osmoles /L .
One more word we need to remember- DENSITY which is mass / volume.
Lets quickly discuss abt water which has a density of 1. To make it simpler....1L of water will be equal to 1kg of water! So if you apply the definition osmolarity & osmolality to water, then they both would be the same.
Since blood has a density close to water i.e 1 (we know that because the specific gravity of blood is 1.03 - 1.05), now we can say that its osmolality is equal to its osmolarity, and sooooooo they can both be used interchangeably.
Osmolarity & Osmolality can be used interchangeably in case of blood/plasma, only beacuse its density is nearly equal to 1. For fluids whose density is not near 1, then you cannot use these terms to mean the same thing, as osmolality & osmolarity will differ.
Is it still not clear ? !
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