82D05 Gases
82D10 Plasmas
82D15 Liquids
82D20 Solids
82D25 Crystals, {For crystallographic group theory, See 20H15}
82D30 Random media, disordered materials (including liquid
crystals and spin glasses)
82D35 Metals
82D40 Magnetic materials
82D45 Ferroelectrics
82D50 Superfluids
82D55 Superconductors
82D60 Polymers
82D75 Nuclear reactor theory
82D99 None of the above but in this section