89.00.00 Other areas of applied and interdisciplinary physics
- 89.20.-a Interdisciplinary applications of physics
- 89.30.-g Energy resources (see also 84.60.-h Direct energy conversion and storage) (1)
- 89.40.-a Transportation
- 89.60.-k Environmental studies (for ecology, see 87.23.-n); Air quality and air pollution, see 92.60.Sz; Erosion sedimentation; sediment transport, see 92.40.Gc; Water quality, see 92.40.kc, and in Geophysics Appendix see 92.40.qc
- 89.65.-s Social and economic systems
- 89.70.-a Information and communication theory (for telecommunications, see 84.40.Ua; for optical communications, see 42.79.Sz; for quantum information, see 03.67.-a; for applications to neuroscience, see 87.19.lo)
- 89.75.-k Complex systems
- 89.90.+n Other topics in areas of applied and interdisciplinary physics (restricted to new topics in section 89)