What is angle of spatula?

Suppose a spatula is covered by a powder cone, and then the spatula is lifted upwards vertically. At this point, the angle between the sloping side of the powder cone and the horizontal plane is called angle 1. Then an external force is applied to cause a vibration on the spatula to obtain angle 2. The average of these two angles is called the angle of spatula. The smaller the angle of spatula is, the better the flowability will be. In general, the angle of spatula is larger than the angle of repose.

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