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Encyclopedia > Free space

In physics, free space is a concept of electromagnetic theory, corresponding roughly to the vacuum, the baseline state of the electromagnetic field, or the replacement for the electromagnetic aether.

It occurs in the expressions permittivity of free space and permeability of free space; one defines the permittivity or permeability of a given material. In this setting it simply means no material present, and so corresponds to a theoretical idea of measurement carried out on a perfect vacuum.

  Results from FactBites:
Free Space Optics (FSO) : Technology History Market Challenges Advantages (2217 words)
Free Space Optics (FSO) or Optical Wireless, refers to the transmission of modulated visible or infrared (IR) beams through the air to obtain optical communications.
Historically, Free Space Optics (FSO) or optical wireless communications was first demonstrated by Alexander Graham Bell in the late nineteenth century (prior to his demonstration of the telephone!).
Unlike radio and microwave systems, Free Space Optics (FSO) is an optical technology and no spectrum licensing or frequency coordination with other users is required, interference from or to other systems or equipment is not a concern, and the point-to-point laser signal is extremely difficult to intercept, and therefore secure.
Orbiter - A free space flight simulator (544 words)
ORBITER is a free flight simulator that goes beyond the confines of Earth's atmosphere.
Launch the Space Shuttle from Kennedy Space Center to deploy a satellite, rendezvous with the International Space Station or take the futuristic Delta-glider for a tour through the solar system - the choice is yours.
Planetary motion, gravitation effects, free space and atmospheric flight are accurately modelled.
  More results at FactBites »



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