# Dimensionless parameters (plasmapy.formulary.dimensionless)¶

Module of dimensionless plasma parameters.

These are especially important for determining what regime a plasma is in. (e.g., turbulent, quantum, collisional, etc.).

For example, plasmas at high (much larger than 1) Reynolds numbers are highly turbulent, while turbulence is negligible at low Reynolds numbers.

## Functions¶

 beta(T, n, B) The ratio of thermal pressure to magnetic pressure. Mag_Reynolds(U, L, sigma) The Magnetic Reynolds number is a dimensionless quantity that estimates the relative contributions of advection and induction to magnetic diffusion in a conducting medium. quantum_theta(T, n_e) Compares Fermi energy to thermal kinetic energy to check if quantum effects are important. Re_(rho, U, L, mu) Alias to Reynolds_number(). Reynolds_number(rho, U, L, mu) The Reynolds Number is a dimensionless quantity that is used to predict flow patterns in fluids. Rm_(U, L, sigma) Alias to Mag_Reynolds().