Osmotic Pressure

Last updated: May 31, 2018

What Does Osmotic Pressure Mean?

Osmotic pressure refers to a force that drives a fluid across a semi-permeable membrane due to a concentration gradient. It is a property that is primarily observed in paint films used to coat metals against corrosion.


Corrosionpedia Explains Osmotic Pressure

Osmotic pressure is a surface distributed force that is formed in mixtures with solute and solutions present. It generates a hydrostatic pressure caused by a difference in the concentration of each component when separated by a membrane.

In the case of salt or brine environments, pressure must be applied to the low-salt concentration side of the system to prevent water movement into the high-salt side. This pressure is hydraulic in nature and is known as the osmotic pressure. Conversely, suction pressure is exerted in a high-salt system on the low-salt system in a similar environment.


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