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- IBM (atoms)IBM in atoms was a demonstration by IBM scientists in 1989 of a technology capable of mani
- Ideal gasMathematical model which approximates the behavior of real gases
- Ideal gas lawEquation of the state of a hypothetical ideal gas
- IEEE Photonics SocietyThe IEEE Photonics Society, formerly the IEEE Lasers and Electro-Optics Society (LEOS), is
- Ignition magnetoAn ignition magneto (also called a high-tension magneto) is an older type of ignition syst
- Igor KurchatovSoviet nuclear physicist (1903–1960)
- IlluminanceLuminous flux incident on a surface per area
- Impact (mechanics)Great force or shock applied over a short time period during a high-speed collision
- Impact factorMeasure of relative importance of a journal
- Impedance of free spacePhysical constant; ratio of electric to magnetic field strength in a vacuum
- Impedance parametersImpedance parameters or Z-parameters (the elements of an impedance matrix or Z-matrix) are
- Implicate and explicate orderImplicate order and explicate order are ontological concepts for quantum theory coined by
- Impossible colorColor that cannot be perceived under ordinary viewing conditions
- Impulse (physics)Integral of a comparatively larger force over a short time interval
- IncandescenceIncandescence is the emission of electromagnetic radiation (including visible light) from
- Incompressible flowFluid flow in which density remains constant
- India-based Neutrino ObservatoryIndian physics research project
- IndigoBlue color
- Indistinguishable particlesConcept in quantum mechanics of perfectly substitutable particles
- Induced gamma emissionIn physics, induced gamma emission (IGE) refers to the process of fluorescent emission of
- InductanceProperty of electrical conductors
- Induction motorType of AC electric motor
- Industrial applications of nanotechnologyNanotechnology is impacting the field of consumer goods, several products that incorporate
- Inelastic collisionCollision in which energy is lost to heat
- Inelastic scatteringParticle scattering in which kinetic energy is not conserved
- InertiaFundamental principle of classical physics
- Inertial frame of referenceFundamental concept of classical mechanics
- Inertial waveInertial waves, also known as inertial oscillations, are a type of mechanical wave possibl
- Infinitesimal rotation matrixType of matrix
- Information dimensionIn information theory, information dimension is an information measure for random vectors
- InfraredForm of electromagnetic radiation
- Ingrid J. PickeringIngrid Jane Pickering FRSC is a geoscientist. She is a professor and Canada Research Chair
- Initiative for Open CitationsThe Initiative for Open Citations (I4OC) is a project launched publicly in April 2017, tha
- InstabilityCharacterized by some of the outputs or internal states growing without bounds
- Institut d'Astrophysique de ParisThe Institut d'Astrophysique de Paris (translated: Paris Institute of Astrophysics) is a r
- Institut Laue–LangevinInternationally financed scientific facility
- Institute for Safe Medication PracticesThe Institute for Safe Medication Practices (ISMP) is an American 501(c)(3) organization f
- Insulator (electricity)Material that does not conduct an electric current
- Intensity (physics)Power transferred per unit area
- Intensive and extensive propertiesProperties independent of system size, and proportional to system size
- Inter-Society Color CouncilThe Inter-Society Color Council (ISCC) is a non-profit learned society which was created i
- Interacting boson modelThe interacting boson model (IBM) is a model in nuclear physics in which nucleons (protons
- Interaction pictureView of quantum mechanics
- Interior Schwarzschild metricStatic exact solution in general relativity
- Internal conversionProcess where an excited nucleus ejects an orbital electron from its atom
- Internal energyEnergy contained within a system
- Internal pressureProperty of a thermodynamic system
- International Arctic Research CenterThe International Arctic Research Center, or IARC, established in 1999, is a research inst
- International Association of Geomagnetism and AeronomyThe International Association of Geomagnetism and Aeronomy (IAGA) is an international scie
- International Centre for Diffraction DataThe International Centre for Diffraction Data (ICDD) maintains a database of powder diffra
- International Glaciological SocietyThe International Glaciological Society (IGS) was founded in 1936 to provide a focus for i
- International Heliophysical YearThe International Heliophysical Year is a UN-sponsored scientifically driven international
- International Union of CrystallographyThe International Union of Crystallography (IUCr) is an organisation devoted to the intern
- International Union of Theoretical and Applied MechanicsThe International Union for Theoretical and Applied Mechanics (IUTAM) is an affiliation of
- Interpretations of quantum mechanicsArea of physical and philosophical debate
- Intersecting Storage RingsThe ISR (standing for "Intersecting Storage Rings") was a particle accelerator at CERN. It
- Intrabeam scatteringIntrabeam scattering (IBS) is an effect in accelerator physics where collisions between pa
- Introduction to electromagnetismNon-technical introduction to topics in electromagnetism
- Introduction to entropyIn thermodynamics, entropy is a numerical quantity that shows that many physical processes
- Introduction to gauge theoryIntroductory article
- Introduction to general relativityTheory of gravity by Albert Einstein
- Introduction to quantum mechanicsNon-mathematical introduction
- Invariant (physics)Type of observable in a physical system
- Invariant massMotion-independent mass, equals total mass when at rest
- Inverse beta decayIn nuclear and particle physics, inverse beta decay, commonly abbreviated to IBD, is a nuc
- Inverse-square lawPhysical law
- Investment trustAn investment trust is a form of investment fund found mostly in the United Kingdom and Ja
- Inviscid flowFlow of fluids with zero viscosity (superfluids)
- InvisibilityState of a matter that cannot be seen
- Involutory matrixIn mathematics, an involutory matrix is a square matrix that is its own inverse. That is,
- IonParticle, atom or molecule with a net electrical charge
- Ion implantationUse of ions to cause chemical changes
- Ion laserAn ion laser is a gas laser that uses an ionized gas as its lasing medium. Like other gas
- Ion mobility spectrometryAnalytical technique used to separate and identify ionized molecules in the gas phase
- Ion trapDevice for trapping charged particles
- IonizationProcess by which atoms or molecules acquire charge by gaining or losing electrons
- Ionizing radiationHarmful high-frequency radiation
- Iota subscriptThe iota subscript is a diacritic mark in the Greek alphabet shaped like a small vertical
- Ira B. BernsteinAmerican theoretical physicist (1924–2024)
- IridescenceOptical property
- IrradianceMeasure of radiant energy over surface area
- IrradiationExposure of objects or people to radiation
- Irreversible processProcess that cannot be undone or reversed
- ISCC–NBS systemInternational system of color designation
- Isentropic processThermodynamic process that is reversible and adiabatic
- Ising modelMathematical model of ferromagnetism in statistical mechanics
- Island of stabilityPrediction in nuclear physics
- ISO 4Standard for abbreviated names of serial publications
- Isobar (nuclide)Atoms of different elements with the same number of nucleons
- Isobaric processThermodynamic process in which pressure remains constant
- Isochoric processThermodynamic process of a closed system in which volume remains constant
- Isolated systemPhysical systems that don't interact with other parts of the universe
- IsospinQuantum number related to the weak interaction
- Isothermal processThermodynamic process in which temperature remains constant
- Isothermal–isobaric ensembleThe isothermal–isobaric ensemble (constant temperature and constant pressure ensemble) is
- IsotoneDifferent nuclides with the same neutron number
- IsotopeAtoms of the same element, but different mass
- Isotope separationConcentrating specific isotopes of a chemical element
- IsotropyUniformity in all orientations
- Israel DostrovskyIsraeli scientist
- Istituto Nazionale di Fisica NucleareThe Istituto Nazionale di Fisica Nucleare (INFN; "National Institute for Nuclear Physics")
