Impeller rotationangularvelocity and flow into a linear relationship, the measured angularvelocityofrotation can be measured flow value.
叶轮的旋转角速度与流量成线形关系，测得旋转角速度就可测得流量值。
2
Concretely, this curl gives you the angularvelocityof the rotation, well, with a factor two but that doesn't matter, and the axis of rotation, the direction of the axis of rotation.
它给出了这个旋转的角速率，有一个因子2，但没关系，给出了旋转轴，和旋转轴的方向。
3
Because of tidal friction and aggrandizement of the earth's volume, the earth's rotationangularvelocity slows down.