# Dimensionless parameters (plasmapy.physics.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¶

 quantum_theta(T, n_e) Compares Fermi energy to thermal kinetic energy to check if quantum effects are important. beta(T, n, B) The ratio of thermal pressure to magnetic pressure.