82Dxx Applications to specific types of physical systems

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