Physics 1,916 Mathematical physics 451 Quantum mechanics; Physics 388 Solid state physics; Properties of matter 268 Physical chemistry 262 Chemistry 230 Quantum theory 221 Chemistry, Physical and theoretical 215 Atomic and Nuclear physics 187 Dissertations, Academic (Ph.D) 185 Nuclear physics 178 Physical Education 172 Thesis (Ph.D)-Physics 162 Sports 151 Mathematics 141 Thermodynamics 141 Solid state physics 139 Electronics engineering; Applied physics 138 Physical Science Teaching 135 Science 120 Particles (Nuclear physics) 108 PHYSICAL CHEMISTRY 105 Physical education 103 Mechanics 94 Statistical physics; Classical mechanics 94 Reports on progress in physics 92 Applied physics 90 Philosophy 90 Plasma physics; Properties of matter 90 Physical fitness 86