angular momentum

angular-momentum的词性：
n.（名词）

1. The vector product of the position vector (from a reference point) and the linear momentum of a particle.
角动量：（有参照点）的矢量和粒子线性动量的向量积

2. The vector sum of the angular momentums of each component particle of an extended body.
动量矩：伸展体的每个组成微粒的角动量的矢量值