Reference library
Foundations
Explore concepts, laws, equations and methods, with clear explanations of their use and sources. Choose an area of study or find a specific entry.
Physics
Choose a topic, or browse all reference entries in this area.
Mechanics & physical modelsMotion, forces, conservation, symmetry and dynamical systems.59 reference entriesFluids & wavesPressure, flow, oscillation, sound and nonlinear wave models.34 reference entriesElectricity & magnetismCharges, fields, circuits and electromagnetic energy.50 reference entriesHeat & statistical physicsThermodynamics, statistical ensembles, transport and phase transitions.49 reference entriesQuantum physicsStates, observables, quantum dynamics, approximation and open systems.63 reference entriesRelativity & gravitationSpacetime, relativistic motion, gravity and cosmological relations.15 reference entriesMatter, nuclei & particlesAtoms, materials, quantum matter, nuclear models and particle interactions.68 reference entriesLight & opticsImaging, interference, diffraction and coherence.26 reference entriesShared & other conceptsOther entries in this field, including foundations shared with other fields.26 reference entries