In the physical sciences, a particle is a small localized object to which can be ascribed several physical properties such as volume or mass. The word is rather general in meaning, and is refined as needed by various scientific fields. Something that is composed of particles may be referred to as particulate, although this term is generally used to refer to a suspension of unconnected particles, rather than a connected particle aggregation.
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Some articles on particle:
... Colloidal particles are the components of a colloid ... The dispersed-phase particles have a diameter of between approximately 5 and 200 nanometers ... Soluble particles smaller than this will form a solution as opposed to a colloid ...
... all space is the probability of finding the particle in all space, which must be unity if the particle exists This is the normalization condition for the wave ... In the limit ħ → 0, the particle's position and momentum become known exactly ... Interpretation of wave function for one spin-0 particle in one dimension ...
... In physics, a free particle is a particle that, in some sense, is not bound by an external force, or equivalently not in a region where its potential energy varies ... In classical physics, this means the particle is present in a "field-free" space ...
... The classical free particle is characterized simply by a fixed velocity v ... energy) by where m is the mass of the particle and v is the vector velocity of the particle ...
... Consider a massless relativistic particle approaching a potential step of height with energy and momentum ... The particle's wave function, follows the time-independent Dirac equation And is the Pauli matrix Assuming the particle is propagating from the left ... of the group velocity of a massless relativistic particle ...
More definitions of "particle":
- (noun): A body having finite mass and internal structure but negligible dimensions.
Famous quotes containing the word particle:
“Experience is never limited, and it is never complete; it is an immense sensibility, a kind of huge spider-web of the finest silken threads suspended in the chamber of consciousness, and catching every air-borne particle in its tissue.”
—Henry James (18431916)
“Standing on the bare ground,my head bathed by the blithe air, and uplifted into infinite space,all mean egotism vanishes. I become a transparent eye-ball; I am nothing; I see all; the currents of the Universal Being circulate through me; I am part and particle of God.”
—Ralph Waldo Emerson (18031882)
“Love is life. All, everything that I understand, I understand only because I love. Everything is, everything exists, only because I love. Everything is united by it alone. Love is God, and to die means that I, a particle of love, shall return to the general and eternal source.”
—Leo Tolstoy (18281910)