What is "gyromagnetic ratio"

n. (context physics English) the ratio of the angular momentum to the magnetic moment in an atom etc

In physics, the gyromagnetic ratio (also sometimes known as the magnetogyric ratio in other disciplines) of a particle or system is the ratio of its magnetic momentum in an atom to its angular momentum, and it is often denoted by the symbol γ, gamma. Its SI unit is the radian per second per tesla (rad⋅s⋅T) or, equivalently, the coulomb per kilogram (C⋅kg).

The term "gyromagnetic ratio" is sometimes used as a synonym for a different but closely related quantity, the g-factor. The g-factor, unlike the gyromagnetic ratio, is dimensionless. For more on the g-factor, see below, or see the article g-factor.