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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. Outer space - Wikipedia

   en.wikipedia.org/wiki/Outer_space

   Outer space. Illustration of Earth's atmosphere gradual transition into outer space. Outer space (or simply space) is the expanse beyond celestial bodies and their atmospheres. It contains ultra-low levels of particle densities, constituting a near-perfect vacuum [1] of predominantly hydrogen and helium plasma, permeated by electromagnetic ...

4. Tsiolkovsky rocket equation - Wikipedia

   en.wikipedia.org/wiki/Tsiolkovsky_rocket_equation

   A rocket's required mass ratio as a function of effective exhaust velocity ratio. The classical rocket equation, or ideal rocket equation is a mathematical equation that describes the motion of vehicles that follow the basic principle of a rocket: a device that can apply acceleration to itself using thrust by expelling part of its mass with high velocity can thereby move due to the ...

5. Speed of light - Wikipedia

   en.wikipedia.org/wiki/Speed_of_Light

   This subscripted notation, which is endorsed in official SI literature, has the same form as related electromagnetic constants: namely, μ 0 for the vacuum permeability or magnetic constant, ε 0 for the vacuum permittivity or electric constant, and Z 0 for the impedance of free space. This article uses c exclusively for the speed of light in ...

6. Mathematics - Wikipedia

   en.wikipedia.org/wiki/Mathematics

   t. e. Mathematicsis an area of knowledgethat includes the topics of numbers, formulas and related structures, shapes and the spaces in which they are contained, and quantities and their changes. These topics are represented in modern mathematics with the major subdisciplines of number theory,[1]algebra,[2]geometry,[1]and analysis,[3]respectively.

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