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The Elsasser number, Λ, is a dimensionless number in magnetohydrodynamics that represents the ratio of magnetic forces to the Coriolis force.
Λ = σ B 2 ρ Ω {\displaystyle \Lambda ={\frac {\sigma B^{2}}{\rho \Omega }}}
where σ is the conductivity of the fluid, B is the magnetic field, ρ is the density of the fluid, and Ω is the rate of rotation of the body.
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