| http://www.w3.org/ns/prov#value | - In these embodiments, the medium 44 is a fluid, such as water, with a low conductivity between about between about 1???10???4 and 5???10???8 siemens and a high permittivity above 80, although other types of mediums, such as a solid material or a solid in the form of a powder or other types of fluids, such as organic or mineral oil, can be used.
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