If you're not sure exactly what you're looking for, you may find it useful to browse the Library shelves at the following call number locations:
QC 1-QC 75 Physics. General
QC 81-QC 114 Weights and measures
QC 120-QC 168.85 Descriptive and experimental mechanics
QC 170-QC 197 Atomic physics. Constitution and properties of matter Including molecular physics, relativity, quantum theory, and solid state physics
QC 221-QC 246 Acoustics. Sound
QC 251-QC 338.5 Heat
QC 310.15-QC 319 Thermodynamics
QC 350-QC 467 Optics. Light
QC 450-QC 467 Spectroscopy
QC 474-QC 496.9 Radiation physics (General)
QC 501-QC 766 Electricity and magnetism
QC 770-QC 798 Nuclear and particle physics. Atomic energy. Radioactivity
QC 801-QC 809 Geophysics. Cosmic physics
QC 811-QC 849 Geomagnetism