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- L3 experimentThe L3 experiment was one of the four large detectors on the Large Electron–Positron Colli
- La Chapelle-Saint-MesminLa Chapelle-Saint-Mesmin (French pronunciation: ) is a commune in the French department of
- La JollaNeighborhood in San Diego, California, United States
- Laboratori Nazionali del Gran SassoPhysics laboratory in Assergi, Italy
- Ladder paradoxThought experiment in special relativity
- Lagrangian mechanicsFormulation of classical mechanics
- Lamb–Oseen vortexIn fluid dynamics, the Lamb–Oseen vortex models a line vortex that decays due to viscosity
- Lambda baryonThe lambda baryons (Λ) are a family of subatomic hadron particles containing one up quark,
- Laminar flowFlow where fluid particles follow smooth paths in layers
- Laminated glassType of safety glass with a thin polymer interlayer that holds together when shattered
- LampworkingType of glasswork
- Lanczos tensorThe Lanczos tensor or Lanczos potential is a rank 3 tensor in general relativity that gene
- Landau kinetic equationThe Landau kinetic equation is a transport equation of weakly coupled charged particles pe
- Langmuir probeA Langmuir probe is a device used to determine the electron temperature, electron density,
- Laplace–Runge–Lenz vectorVector used in astronomy
- Large Electron–Positron ColliderThe Large Electron–Positron Collider (LEP) was one of the largest particle accelerators ev
- Large extra dimensionsTheory in particle physics
- Large Hadron ColliderParticle accelerator at CERN, Switzerland
- Largs, New South WalesLargs is a developing township adjacent to Bolwarra Heights and is a suburb in the City of
- Larmor formulaGives the total power radiated by an accelerating, nonrelativistic point charge
- Laser ablationLaser ablation or photoablation (also called laser blasting) is the process of removing ma
- Laser coolingCooling technique in atomic physics
- Laser-heated pedestal growthCrystal growth technique
- Latent heatThermodynamic phase transition energy
- Lattice gas automatonLattice gas automata (LGCA), or lattice gas cellular automata, are a type of cellular auto
- Lattice gauge theoryIn physics, lattice gauge theory is the study of gauge theories on a spacetime that has be
- Lattice QCDQuantum chromodynamics on a lattice
- Laura CadonatiAmerican gravitational waves physicist
- LausenLausen is a municipality in the district of Liestal in the canton of Basel-Country in Swit
- Lavender (color)Light shade of purple derived from the lavender plant
- Laws of thermodynamicsObservational basis of thermodynamics
- LC circuitElectrical resonant circuit
- Lead glassVariety of glass in which lead replaces the calcium content
- Lemaître–Tolman metricLorentzian metric describing an isotropic, expanding, nonhomogenous universe
- Length contractionContraction of length in the direction of propagation in Minkowski space
- Length measurementWays in which length, distance or range can be measured
- Length scaleParticular length or distance determined with the precision of a few orders of magnitude
- Lenin PrizeHighest Soviet state award
- Lenz's lawElectromagnetic opposition to change
- Léon BrillouinFrench physicist (1889–1969)
- Leonard EisenbudAmerican physicist (1913–2004)
- Leonardo Senatore (physicist)Leonardo Senatore is an Italian theoretical physicist and professor at the Stanford Instit
- Leonid BrekhovskikhSoviet and Russian scientist (1917 - 2005)
- LeptonClass of elementary particles
- Lepton numberDifference between number of leptons and antileptons
- Lev ArtsimovichSoviet physicist (1909–1973)
- Level sensorLevel sensors detect the level of liquids and other fluids and fluidized solids, including
- Library of Congress Control NumberNumbering system for catalog records
- Lie algebra extensionCreating a "larger" Lie algebra from a smaller one, in one of several ways
- Lie superalgebraAlgebraic structure used in theoretical physics
- Liénard–Wiechert potentialElectromagnetic effect of point charges
- Lift (force)Force perpendicular to flow of surrounding fluid
- LightElectromagnetic radiation humans can see
- Light beamProjection of light energy
- Light coneSet of spacetime events, light-connected to a given event
- Light-emitting diode physicsPractical physics application
- LightnessProperty of a color
- Lillian Elvira Moore AbbotLillian Elvira Moore Abbot (née Moore; June 3, 1869 – June 1, 1944) was an American artist
- Lime (color)Shade of yellow-green
- Limiting case (philosophy of science)In the philosophy of science, under the correspondence principle, a limiting case theory i
- Lindau Nobel Laureate MeetingsThe Lindau Nobel Laureate Meetings are annual scientific conferences held in Lindau, Bavar
- Line of purplesEdge of visible color
- Linear circuitElectronic circuits obeying the superposition principle
- Linear densityMass per unit length
- Linear motionType of motion in which the path of the moving object is a straight line
- Linear particle acceleratorType of particle accelerator
- Linear polarizationElectromagnetic radiation special case
- Linear relationType of mathematical equation
- Linearized augmented-plane-wave methodMethod in physics
- Linearized gravityLinear perturbations to solutions of nonlinear Einstein field equations
- Linearly ordered groupIn mathematics, specifically abstract algebra, a linearly ordered or totally ordered group
- LinkebeekLinkebeek (Dutch: , French: ) is a Belgian municipality in the Halle-Vilvoorde district (a
- Liouville's equationIn differential geometry, Liouville's equation, named after Joseph Liouville, is the nonli
- LiquidState of matter
- Liquid crystalState of matter with properties of both conventional liquids and crystals
- Liquid metalMetal or alloy that is liquid at room temperature
- Liquid metal embrittlementLoss of ductility when exposed to liquid metals
- Lisa RandallAmerican theoretical physicist (b. 1962)
- List of particlesList of particles in matter including fermions and bosons
- List of unsolved problems in physicsSome of the major unsolved problems in physics are theoretical, meaning that existing theo
- Lithium Tokamak ExperimentThe Lithium Tokamak Experiment (LTX), and its predecessor, the Current Drive Experiment-Up
- Little Joe TowerLittle Joe Tower is a landmark structure in Corning, New York, United States.
- LK-99Proposed superconducting material
- Local hidden-variable theoryInterpretation of quantum mechanics
- Locomotion in spaceMovement of astronaut's bodies in outer space
- LodestoneNaturally magnetized mineral
- London equationsElectromagnetic equations describing superconductors
- Longitudinal waveType of wave
- Looming and similar refraction phenomenaWhile mirages are the best known atmospheric refraction phenomena, looming and similar ref
- Loop quantum gravityTheory of quantum gravity merging quantum mechanics and general relativity
- Lorentz covarianceConcept in relativistic physics
- Lorentz factorQuantity in relativistic physics
- Lorentz forceForce acting on charged particles in electric and magnetic fields
- Lorentz groupLie group of Lorentz transformations
- Lorentz scalarIn a relativistic theory of physics, a Lorentz scalar is a scalar expression whose value i
- Lorentz transformationFamily of linear transformations
- Lorenz gauge conditionGauge fixing of electro magnetic potential
- Los Alamos Neutron Science CenterThe Los Alamos Neutron Science Center (LANSCE), formerly known as the Los Alamos Meson Phy
- Loschmidt's paradoxConflict between known physical principles (time symmetry and entropy)
- LoudnessSubjective perception of sound pressure
- Low emissivityState of low thermal energy
- Low-dispersion glassLens glass material with reduced refractive index shift with wavelength
- Low-energy electron diffractionLow-energy electron diffraction (LEED) is a technique for the determination of the surface
- Lowell S. BrownAmerican physicist (1934–2023)
- LSZ reduction formulaConnection between correlation functions and the S-matrix
- Lu Jeu ShamAmerican physicist (born 1938)
- Luboš MotlCzech physicist and translator
- Luciano MaianiSammarinese physicist
- LuciferinClass of light-emitting chemical compounds
- Luma (video)In video, luma () represents the brightness in an image (the "black-and-white" or achromat
- LuminancePhotometric measure
- LuminescenceSpontaneous emission of light by a substance
- Luminiferous aetherObsolete postulated medium for the propagation of light
- Luminosity function (astronomy)In astronomy, a luminosity function gives the number of stars or galaxies per luminosity i
- Luminous efficiency functionDescription of the average spectral sensitivity of human visual perception of brightness
- Luminous fluxPerceived luminous power
- Luminous intensityVisible light per unit solid angle
- Luna Park, MelbourneLuna Park Melbourne is a historic amusement park located on the foreshore of Port Phillip
