Conversion Factors for Electrical Resistivity

Equations 114-116 can be written down in terms of an electrical capacitance, Cl, an inductance, Ii, and a resistance, Ri, as well (Eig. 14c). In order to find the values for Ci, Ii, and Ri, one needs the conversion factor between electrical and mechanical impedances. We have ... 

Dielectrics and insulators can be defined as materials with high electrical resistivities. Dielectrics fulfil circuit functions for which their permittivities e and dissipation factors tan S are also of primary importance. Insulators are used principally to hold conductive elements in position and to prevent them from coming in contact with one another. A good dielectric is, of course, necessarily a good insulator, but the converse is by no means true. 

Conversion of glass to a polycrystalline ceramic is accompanied by increased strength (two to four times), increased fracture toughness (two to four times), increased electrical resistivity (10 times), increased deformation temperature (200-400°C), increased abrasion resistance, and increased thermal shock resistance. All these factors contribute to many applications for glass ceramics dinnerware, cooking utensils, stove tops, radomes, hermetic seals to metals, building materials, and so on. 

The following appendices provide references to standards, fire resistance nomenclature, electrical ratings, hydraulic data, and conversion factors commonly referred to while examining and designing fire and explosion protection systems for the process industry. 

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