qc1-999 physics
qc81-114 weights and measures
qc120-168.85 descriptive and experimental mechanics
qc170-197 atomic physics
qc221-246 acoustics. sound
qc251-338.5 heat
qc350-467 optics. light
qc474-496.9 radiation physics (general)
qc501-766 electricity and magnetism
qc501-(721) electricity
qc750-766 magnetism
qc770-798 nuclear and particle physics. atomic energy. radioactivity
qc801-809 geophysics. cosmic physics
qc811-849 geomagnetism
qc851-999 meteorology. climatology