Physics
Articles about matter, energy, forces and physical laws.
Gravitino
Graviton
Graviton: the hypothetical quantum of the gravitational field
Gravity
Gravity (Gravitation)
Gravity is the universal attraction between masses. Described by Newton's inverse-square law for orbits and by Einstein's curvature of spacetime, it shapes motion from falling appl
Gravity wave
Gravity wave (fluid dynamics)
Ground state
Group velocity
Group velocity: speed of a wave packet and its physical significance
Group velocity is the rate at which a wave packet's envelope—and often energy or information—propagates. It differs from phase velocity and is central to dispersion, pulse spreadin
Gyroscope
Gyroscope: principles, types, history and applications
A gyroscope is a device that measures or preserves orientation using a spinning rotor and angular momentum. This article explains how gyroscopes work, their types, history, uses, a
Hadron
Hadron: composite particles of quarks and the strong interaction
Hadrons are composite subatomic particles made of quarks and bound by the strong interaction. This article explains their structure, classification, history, examples, and signific
Hamiltonian mechanics
Hardness
Hardness (materials): definition, measurement methods and applications
Harmonic
Harmonic: integer-multiple frequency components in waves and signals
Hawking radiation
Hawking radiation: quantum emission from black holes
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Heat
Heat capacity
Heat conduction
Heat conduction (thermal conduction)
Heat index
Heat index: how humidity and temperature shape perceived heat
Heat lamp
Heat lamp: function, types, uses, and safety
Heat transfer
Heat transfer: modes, principles, history and practical applications
Height
Heisenberg's uncertainty principle
Helium-4
Helium-4 (4He): Properties, Origin, and Superfluid Behavior
Henry (unit)
Hertz
Hertz: the SI unit of frequency
Higgs boson
Higgs field
Hooke's law
Hooke's law: linear elasticity and simple springs
Horsepower
Horsepower: unit of power, origins, definitions, and common uses
Hydrostatic equilibrium
Hyperon
Hyperon: Strange baryons in particle physics
Hypersonic speed
Hysteresis
Hysteresis: memory and lag in physical, biological, and engineered systems
Ideal gas
Ideal gas (idealized gas model)
Ideal gas law
Impulse (physics)
Impulse is the time integral of force that produces a change in momentum. It links force and motion, with applications from collisions to rocketry and safety design.
Inch of mercury
Inch of mercury (inHg): a historical unit of pressure
Inclined plane
Inclined Plane (Simple Machine)
Inductively coupled plasma
Inductor
Inductor (electrical component)
Inertia
Inertia (physics): resistance to changes in motion
Infrared
Infrared radiation
Infrasound
Insertion device
Insertion device (magnet assembly for synchrotron light sources)
Insulator (electricity)
Electrical insulator (electricity)
Intensity (physics)
Interference
Interference (wave phenomena)
Intermolecular force
Internal energy
Internal energy (thermodynamics)