Example image of eyePlorer eyePlorer map for 'Classical and quantum conductivity': Electron Metal Electrical conductivity Fermi gas Electrical conduction Quantum mechanics Amorphous solid Crystal Covalent bond Ionic bond Metallic bond Ionic crystal Crystal structure Cubic crystal system Ion Hexagonal crystal system Boltzmann constant Coulomb's law Electric charge Madelung constant Potential energy Electrostatics Derivative Lattice energy Hybridisation Atomic radius Atomic nucleus Bohr radius Schrödinger equation Wave function Probability amplitude Kinetic energy Valence electron Chemical element Periodic table Paul Drude Electricity Conduction (heat) Electrical conductor Ohm's law Thermodynamic equilibrium Electric field Voltage Drift velocity Electric current Resistivity Mean free path Kelvin Maxwell–Boltzmann distribution Maxwell–Boltzmann statistics