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2. Vacuum permittivity - Wikipedia

   en.wikipedia.org/wiki/Vacuum_permittivity

   Vacuum permittivity, commonly denoted ε0 (pronounced "epsilon nought" or "epsilon zero"), is the value of the absolute dielectric permittivity of classical vacuum. It may also be referred to as the permittivity of free space, the electric constant, or the distributed capacitance of the vacuum. It is an ideal (baseline) physical constant.

3. Impedance of free space - Wikipedia

   en.wikipedia.org/wiki/Impedance_of_free_space

   The impedance of free space (that is, the wave impedance of a plane wave in free space) is equal to the product of the vacuum permeability μ 0 and the speed of light in vacuum c 0. Before 2019, the values of both these constants were taken to be exact (they were given in the definitions of the ampere and the metre respectively), and the value ...

4. Vacuum permeability - Wikipedia

   en.wikipedia.org/wiki/Vacuum_permeability

   The vacuum magnetic permeability (variously vacuum permeability, permeability of free space, permeability of vacuum, magnetic constant) is the magnetic permeability in a classical vacuum. It is a physical constant, conventionally written as μ0 (pronounced "mu nought" or "mu zero"). It quantifies the strength of the magnetic field induced by an ...

5. Free-space path loss - Wikipedia

   en.wikipedia.org/wiki/Free-space_path_loss

   Free-space path loss. In telecommunications, the free-space path loss (FSPL) (also known as free-space loss, FSL) is the attenuation of radio energy between the feedpoints of two antennas that results from the combination of the receiving antenna's capture area plus the obstacle-free, line-of-sight (LoS) path through free space (usually air). [1]

6. Free-space optical communication - Wikipedia

   en.wikipedia.org/wiki/Free-space_optical...

   At the top right corner is a monocular for assisting the alignment of the two heads. Free-space optical communication (FSO) is an optical communication technology that uses light propagating in free space to wirelessly transmit data for telecommunications or computer networking. "Free space" means air, outer space, vacuum, or something similar.

7. Four-dimensional space - Wikipedia

   en.wikipedia.org/wiki/Four-dimensional_space

   Vectors. Mathematically, a four-dimensional space is a space that needs four parameters to specify a point in it. For example, a general point might have position vector a, equal to. This can be written in terms of the four standard basis vectors (e1, e2, e3, e4), given by. so the general vector a is.

8. The World Set Free ( Cosmos: A Spacetime Odyssey )

   en.wikipedia.org/wiki/The_World_Set_Free_(Cosmos:...

   Cosmos: A Spacetime Odyssey. ) " The World Set Free " is the twelfth episode of the American documentary television series Cosmos: A Spacetime Odyssey. It premiered on June 1, 2014, on Fox, and aired on June 2, 2014, on National Geographic Channel. The episode was written by Ann Druyan and Steven Soter, and directed by Brannon Braga.

9. Free surface - Wikipedia

   en.wikipedia.org/wiki/Free_surface

   Free surface. In physics, a free surface is the surface of a fluid that is subject to zero parallel shear stress, [1] such as the interface between two homogeneous fluids. [2] An example of two such homogeneous fluids would be a body of water (liquid) and the air in the Earth's atmosphere (gas mixture). Unlike liquids, gases cannot form a free ...