1. The vector product of the position vector (from a reference point) and the linear momentum of a particle.2. The vector sum of the angular momentums of each infinitesimal component particle of an extended body.
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RKM engine — The Rotary Piston Machine, or in its German originalRotationskolbenmaschine (R.K.M.) is a new (still in development) formof machine. It can be used either to transform pressure intorotational motion (an engine), or the converse rotationalmotion… … Wikipedia