A.1 Different Values of Relative Permittivity (&) Based on the Material Material Er Material ET Vacuum Quartz 5 Freon Diamond 5-6 Air 1.0005 Wet soil 5-15 Styrofoam 1.03 Mica (ruby) 5.4 Polyurethane foam 1.1 Steatite 5.8 Paper 1.3-3 Sodium chloride (NaCl) 5.9 Wood 2-5 Porcelain 6 Dry soil 2-6 Neoprene 6.6 Paraffin 2.1 Silicon nitride (Sig N4) 7.2 Teflon 2.1 Marble 8 Vaseline 2.16 Alumina (Al203) 8.8 Polyethylene 2.25 Animal and human muscle 10 Oil 2.3 Silicon (Si) 11.9 Rubber 2.4-3 Gallium arsenide 13 Polystyrene 2.56 Germanium 16 PVC 2.7 Ammonia (liquid) 22 Amber 2.7 Alcohol (ethyl) 25 Plexiglass 3.4 Tantalum pentoxide 25 Nylon 3.6-4.5 Glycerin 50 Fused silica (SiO2) 3.8 Ice 75 Sulfur 4 Water 81 Glass 4-10 Rutile (TiO2) 89-173 Bakelite 4.74 Barium titanate (BaTiOs) 1.200 * For static or low-frequency applied electric fields, at room temperature