The dielectric constant of pure water is 78.54 Fm-1 at 298 K and decreases  slightly as a result of increasing ionic strength at physiological salt concentrations. It is also affected by temperature.

http://chemistry.stackexchange.com/questions/16434/salt-concentration-and-electrical-permittivity-of-water

Hello Umapathi,

You use the word 'find' so I'm not sure if you want to calculate or measure the value.

If you have access to a network analyser, LCR meter, semiconductor analyser or impedance analyser you could measure it?

I attach a link to a document I hope you find useful. Hope this helps.

Kindest regards,

Jules

Hello Jules,

Actually its for simulation purpose.I would like to know by calculating or measuring from theoretical approaches or some simulation software.

Best regards

Umapathi.