Iron(II) sulfide or ferrous sulfide (Br.E. sulphide) is a chemical compound with the formula FeS. In the oil/gas industry, iron sulfides are often present in a sour system due to reaction between corrosion products and hydrogen sulfide.
A material that conducts (see conduction) electricity poorly or not at all. If a voltage is applied to a dielectric, the atoms in the material arrange themselves in such a way as to oppose the flow of electric current. Glass, wood, and plastic are common dielectrics. (See insulator.)
Completely filling the space between capacitor plates with a dielectric increases the capacitance by a factor of the dielectric constant: C = Îº C. For a parallel-plate capacitor containing a dielectric that completely fills the space between the plates, the capacitance is given by: C = Îº Îµ. The capacitance is maximized if the dielectric constant is maximized, and the capacitor plates have large area and are placed as close together as possible.