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• Point_particle abstract "A point particle (ideal particle or point-like particle, often spelled pointlike particle) is an idealization of particles heavily used in physics. Its defining feature is that it lacks spatial extension: being zero-dimensional, it does not take up space. A point particle is an appropriate representation of any object whose size, shape, and structure is irrelevant in a given context. For example, from far enough away, an object of any shape will look and behave as a point-like object.In the theory of gravity, physicists often discuss a point mass, meaning a point particle with a nonzero mass and no other properties or structure. Likewise, in electromagnetism, physicists discuss a point charge, a point particle with a nonzero charge.Sometimes, due to specific combinations of properties, extended objects behave as point-like even in their immediate vicinity. For example, spherical objects interacting in 3-dimensional space whose interactions are described by the inverse square law behave in such a way as if all their matter were concentrated in their centers of mass. In Newtonian gravitation and classical electromagnetism, for example, the respective fields outside of a spherical object are identical to those of a point particle of equal charge/mass located at the center of the sphere.In quantum mechanics, the concept of a point particle is complicated by the Heisenberg uncertainty principle, because even an elementary particle, with no internal structure, occupies a nonzero volume. For example, the atomic orbit of an electron in the hydrogen atom occupies a volume of ~10−30 m3. There is nevertheless a distinction between elementary particles such as electrons or quarks, which have no known internal structure, versus composite particles such as protons, which do have internal structure: A proton is made of three quarks. Elementary particles are sometimes called \"point particles\", but this is in a different sense than discussed above. For more details see elementary particle.".
• Point_particle thumbnail Example_of_a_point.svg?width=300.
• Point_particle wikiPageExternalLink article?id=0303750-00.
• Point_particle wikiPageExternalLink article?id=0325780-00.
• Point_particle wikiPageExternalLink ?id=Tm0FAAAAQAAJ&pg=PA270.
• Point_particle wikiPageExternalLink PointCharge.html.
• Point_particle wikiPageExternalLink 301.
• Point_particle wikiPageID "1266589".
• Point_particle wikiPageLength "9712".
• Point_particle wikiPageOutDegree "79".
• Point_particle wikiPageRevisionID "707385432".
• Point_particle wikiPageWikiLink 0_(number).
• Point_particle wikiPageWikiLink Addison-Wesley.
• Point_particle wikiPageWikiLink Atomic_orbital.
• Point_particle wikiPageWikiLink Benjamin_Motte.
• Point_particle wikiPageWikiLink Cambridge_University_Press.
• Point_particle wikiPageWikiLink Category:Classical_mechanics.
• Point_particle wikiPageWikiLink Category:Concepts_in_physics.
• Point_particle wikiPageWikiLink Center_of_mass.
• Point_particle wikiPageWikiLink Charge_(physics).
• Point_particle wikiPageWikiLink Classical_electron_radius.
• Point_particle wikiPageWikiLink Coulombs_law.
• Point_particle wikiPageWikiLink Dimension.
• Point_particle wikiPageWikiLink Earnshaws_theorem.
• Point_particle wikiPageWikiLink Electric_charge.
• Point_particle wikiPageWikiLink Electric_field.
• Point_particle wikiPageWikiLink Electromagnetism.
• Point_particle wikiPageWikiLink Electron.
• Point_particle wikiPageWikiLink Electrostatics.
• Point_particle wikiPageWikiLink Elementary_particle.
• Point_particle wikiPageWikiLink Encyclopedia_Americana.
• Point_particle wikiPageWikiLink Equation.
• Point_particle wikiPageWikiLink Extension_(metaphysics).
• Point_particle wikiPageWikiLink Field_(physics).
• Point_particle wikiPageWikiLink Gravitational_field.
• Point_particle wikiPageWikiLink Gravity.
• Point_particle wikiPageWikiLink Grolier.
• Point_particle wikiPageWikiLink Hydrogen_atom.
• Point_particle wikiPageWikiLink Idealization.
• Point_particle wikiPageWikiLink Infinity.
• Point_particle wikiPageWikiLink Integral.
• Point_particle wikiPageWikiLink Inverse-square_law.
• Point_particle wikiPageWikiLink Lepton.
• Point_particle wikiPageWikiLink List_of_particles.
• Point_particle wikiPageWikiLink Mass.
• Point_particle wikiPageWikiLink Matter.
• Point_particle wikiPageWikiLink Mechanical_equilibrium.
• Point_particle wikiPageWikiLink Neutron.
• Point_particle wikiPageWikiLink Newtons_law_of_universal_gravitation.
• Point_particle wikiPageWikiLink Particle.
• Point_particle wikiPageWikiLink Photon.
• Point_particle wikiPageWikiLink Physics.
• Point_particle wikiPageWikiLink Point_(geometry).
• Point_particle wikiPageWikiLink Probability_distribution.
• Point_particle wikiPageWikiLink Proton.
• Point_particle wikiPageWikiLink Quantum_field_theory.
• Point_particle wikiPageWikiLink Quantum_mechanics.
• Point_particle wikiPageWikiLink Quantum_state.
• Point_particle wikiPageWikiLink Quantum_superposition.
• Point_particle wikiPageWikiLink Quark.
• Point_particle wikiPageWikiLink Random_variable.
• Point_particle wikiPageWikiLink Self-propelled_particles.
• Point_particle wikiPageWikiLink Statistics.
• Point_particle wikiPageWikiLink Uncertainty_principle.
• Point_particle wikiPageWikiLink University_of_California_Press.
• Point_particle wikiPageWikiLink W._W._Norton_&_Company.
• Point_particle wikiPageWikiLink Wave_packet.
• Point_particle wikiPageWikiLink File:Example_of_a_point.svg.
• Point_particle wikiPageWikiLink File:Quark_structure_proton.svg.
• Point_particle wikiPageWikiLink File:Scalar_potential_of_a_point_charge.jpg.
• Point_particle wikiPageWikiLinkText ""point-like" particles".
• Point_particle wikiPageWikiLinkText "''point-like''".
• Point_particle wikiPageWikiLinkText "''punctual''".
• Point_particle wikiPageWikiLinkText "Point particle".
• Point_particle wikiPageWikiLinkText "Point particle#Point mass".
• Point_particle wikiPageWikiLinkText "Point particle#Point_mass".
• Point_particle wikiPageWikiLinkText "material point".
• Point_particle wikiPageWikiLinkText "material points".
• Point_particle wikiPageWikiLinkText "particle".
• Point_particle wikiPageWikiLinkText "particles".
• Point_particle wikiPageWikiLinkText "point charge".
• Point_particle wikiPageWikiLinkText "point charges".
• Point_particle wikiPageWikiLinkText "point mass".
• Point_particle wikiPageWikiLinkText "point masses".
• Point_particle wikiPageWikiLinkText "point particle".
• Point_particle wikiPageWikiLinkText "point".
• Point_particle wikiPageWikiLinkText "point-like objects".
• Point_particle wikiPageWikiLinkText "point-like particles".
• Point_particle wikiPageWikiLinkText "point-like".
• Point_particle wikiPageUsesTemplate Template:Cite_book.
• Point_particle wikiPageUsesTemplate Template:Cite_encyclopedia.
• Point_particle wikiPageUsesTemplate Template:Doi.
• Point_particle wikiPageUsesTemplate Template:Main.
• Point_particle wikiPageUsesTemplate Template:Reflist.
• Point_particle wikiPageUsesTemplate Template:Standard_model.
• Point_particle subject Category:Classical_mechanics.
• Point_particle subject Category:Concepts_in_physics.
• Point_particle hypernym Idealization.
• Point_particle type Concept.
• Point_particle type Mechanic.

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