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- ratio of plasma pressure to magnetic pressure, used in magnetospheric physics as well as fusion plasma physics.
* Thiele modulus - describes the relationship between diffusion and reaction rate in porous catalyst pellets with no mass transfer limitations.
* Numerical aperture - characterizes the range of angles over which the system can accept or emit light.
* Zukoski number, usually noted , is the ratio of the heat release rate of a fire to the

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