How to measure conductivity of Ni foam ?

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How to calculate current density ?

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Mohammed Al-Ameri

You can calculate the optical conductivity using optical coefficient , refractive index , and the speed of light in space, you can look at the following equation which were attached in the following pdf document:

Mohammed Amer Shaheed

I a agree with Kerstin Neuhaus

Suresh S. Balpande

Use electrometer with resistivity chamber for such measurements.