The contributions of Albert Einstein in the field of osmotic theory and contradictions related to it are discussed. Osmotic pressure is sometimes defined as the pressure exerted on a membrane, permeable only to solvent, separating the solution from the pure solvent. Einstein used the molecular theory of heat developed by Herapath, Waterson and this statistical approach became helpful for the kinetic theory of gases. The excess pressure on the solution over the pressure of the solvent, which establish an osmotic equilibrium is the definition of the osmotic pressure. According to Einstein the dissolved molecules or the large particles of a suspension exert a real pressure on the wall of the vessel and on the semi-permeable membrane dividing the vessel into two parts and serves as a piston. It is well known that the dissolved molecules do not exert any such pressure and the osmotic pressure is a pressure that must be applied to the solution to bring it into a certain equilibrium condition.
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Electrical and Electronic Engineering