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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 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 ?id=Tm0FAAAAQAAJ&pg=PA270.
- Point_particle wikiPageExternalLink article?id=0303750-00.
- Point_particle wikiPageExternalLink article?id=0325780-00.
- Point_particle wikiPageExternalLink PointCharge.html.
- Point_particle wikiPageExternalLink 301.
- Point_particle wikiPageID "1266589".
- Point_particle wikiPageRevisionID "581614093".
- Point_particle hasPhotoCollection Point_particle.
- Point_particle subject Category:Classical_mechanics.
- Point_particle subject Category:Concepts_in_physics.
- Point_particle type Abstraction100002137.
- Point_particle type Cognition100023271.
- Point_particle type Concept105835747.
- Point_particle type Content105809192.
- Point_particle type FundamentalPhysicsConcepts.
- Point_particle type Idea105833840.
- Point_particle type PsychologicalFeature100023100.
- Point_particle comment "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.".
- Point_particle label "Particule ponctuelle".
- Point_particle label "Point particle".
- Point_particle label "Ponto material".
- Point_particle label "Punto material".
- Point_particle label "Punto materiale".
- Point_particle label "جسيم نقطي".
- Point_particle label "点粒子".
- Point_particle label "點粒子".
- Point_particle sameAs Bodová_částice.
- Point_particle sameAs Υλικό_σημείο.
- Point_particle sameAs Punto_material.
- Point_particle sameAs Particule_ponctuelle.
- Point_particle sameAs Punto_materiale.
- Point_particle sameAs 点粒子.
- Point_particle sameAs 점입자.
- Point_particle sameAs Ponto_material.
- Point_particle sameAs m.04nk59.
- Point_particle sameAs Q1068091.
- Point_particle sameAs Q1068091.
- Point_particle sameAs Point_particle.
- Point_particle wasDerivedFrom Point_particle?oldid=581614093.
- Point_particle depiction Example_of_a_point.svg.
- Point_particle isPrimaryTopicOf Point_particle.
