Matter
Name:
Matter
Detailed information:
Anything that has mass or occupies space.See Mass. (1) States: There are three generally accepted states (phases) in which substances can exist, i.e., solid, liquid, and gas (vapor). From time to time it has been proposed that specialized forms of matter be regarded as states, such as the vitreous (glassy) state, the colloidal state, and the plasma state, but none of these suggestions has gained substantial acceptance.See Phase; Solid; Liquid; Gas. (2) Levels: Matter is basically composed of particles in the following levels of size and complexity: (a) subatomic (protons, neutrons, electrons); (b) atomic and molecular (below 10 Å); (c) colloidal (from 10 Å to 1 micron); (d) microscopic; (e) macroscopic; (f) space or celestial. Level (a) is invisible by any means; levels (b) and (c) can be resolved in field-ion or electron microscopes; level (d) lies in the range of the optical microscope; (e) is visible to the naked eye; (f) requires telescopes for detailed observation.See Particle; Electron Microscope; Field-ion Microscope.
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