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**Coomber's relationship** can be used to describe how the internal pressure and dielectric constant of a non-polar liquid are related.

As , which defines the internal pressure of a liquid, it can be found that: where

- is equal to the number of molecules
- is the ionization potential of the liquid
- is a temperature dependent relation based on numerical constants of the pair summation from inter-particle geometry
- is the polarizability
- is the volume of the liquid

where for most non-polar liquids

- Meeten, G.H., "Theoretical Basis for Coomber's Relationship",
*Nature*Vol. 223, August 23, 1969