(Physique) Rotation d'une particule élémentaire.
In physics, the intrinsic angular momentum of a subatomic particle, nucleus, atom, or molecule, which continues to exist even when the particle comes to rest. A particle in a specific energy state has a particular spin, just as it has a particular electric charge and mass. According to quantum theory, this is restricted to discrete and indivisible values, specified by a spin quantum number. Because of its spin, a charged particle acts as a small magnet and is affected by magnetic fields.
1. A swift whirling motion (usually of a missile).
2. The act of rotating rapidly; SYN. twirl, twist, twisting, whirl.