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According to Particle Engineering Research Center (P.E.R.C.): "Particle is a small discrete quantity of matter that has an interface with the surrounding environment. Most often particles are associated with solid materials that have an interface with an enveloping gas or liquid. However, particles might just as easily be liquid droplets in air, bubbles in water or emulsions. There is no rule governing how large or small an object must be to be considered a particle. Some define particles as ranging from one nanometer to one millimeter. Some place no size restriction at all - a heavenly body such as a planet or a star might be considered to be a very large particle. However, particle scientists generally leave the astronomical bodies and the molecular or sub-atomic particles to astronomers and physicists."1
Particle may refer to:
In chemistry:
- Colloidal particle, part of a one-phase system of two or more components
In physics:
- Subatomic particle, which may be either:
- Composite particle, a bound state between several elementary particles
- Elementary particle, a particle of which larger particles are composed, also called a fundamental particle
- Point particle, an idealized particle that does not have any volume
- See also list of particles
In other contexts:
- Grammatical particle, in linguistics, a useful catch-all lacking a strict definition
- Particle (band), a 2000 jam band from Los Angeles, California
- Particle (ecology), in marine and freshwater ecology, a small object
- Particle (nanotechnology), a small object that behaves as a whole unit in terms of its transport and properties
- Particle system, in computer graphics, a technique to simulate certain fuzzy phenomena
- Particulate matter, in the areas of atmospheric physics and air pollution
See also
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Wikipedia content modification information:
- This page was last modified on 22 November 2008, at 08:06.
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