Dear Hemant,

The following publication describes a method for calculating a dielectric constant:

Determining dielectric constants using a parallel plate capacitor

T. T. Grove, M. F. Masters, and R. E. Miers

 accepted 22 July 2004!

The availability of low cost digital multimeters capable of measuring capacitance has made parallel plate capacitor investigations common in the introductory laboratory. Typically, students add multiple thin sheets of dielectric material between conducting plates. The capacitance is measured and then plotted versus the reciprocal of the dielectric thickness ~the nominal plate separation!. We

explain why the experiment fails for small dielectric thickness and discuss an improved version of the experiment using dielectric sheets of various thicknesses rather than multiple thin sheets of a dielectric.

http://users.df.uba.ar/sgil/physics_paper_doc/papers_phys/e%26m/dielectr_const_2k4.pdf

Another publications which may interest you are contained in the following links:

https://www.researchgate.net/publication/235010180_The_Dielectric_Constant_of_Lubrication_Oils

http://www.machinerylubrication.com/Read/226/dielectric-constant-oil-analysis

http://deltacnt.com/99-00032.htm

http://www.engineeringtoolbox.com/liquid-dielectric-constants-d_1263.html

http://www.dtic.mil/dtic/tr/fulltext/u2/a347479.pdf

Hoping this will be helpful,

Rafik

Article The Dielectric Constant of Lubrication Oils

Thanks a lot for detailed information about the article...