[decimon]

Osmolarity is the measure of solute concentration, defined as the number of osmoles (Osm) of solute per liter (L) of solution (osmol/L or Osm/L).

Osmolality is a measure of the osmoles of solute per kilogram of solvent (osmol/kg or Osm/kg).

This is all part of the conspiracy to make me feel stupid. ;-)

[dangerdoc]

Don’t feel bad, LOL, I had to dust off an old book and look it up.

Tomorrow, I would need to pull out the same book and look it up again.

If the solution weighs 1 kg/liter they are the same anyway.