4 
Walter Stiles 
Relation of Osmotic Pressure to Temperature 
and Concentration 
The osmotic pressure of an aqueous solution depends on the dis¬ 
solved substance, its concentration and the temperature. In the case 
of dilute solutions, Pfeffer (1877) concluded that the osmotic pressure 
Fig. 4. Relation between concentration of a solution and its osmotic pressure. 
I. Measured values for sucrose. II. Measured values for glucose. III. Theo¬ 
retical values calculated from the equation PV — nRT. (Data from Morse 
and collaborators.) 
is proportional to the absolute temperature and to the concentration, 
that 1S ’ P = K . CT, 
where P is the osmotic pressure, C the concentration and T the 
absolute temperature. 
Now the concentration is the reciprocal of the volume occupied 
by unit mass of the solute, so that the relation becomes similar in 
