angle of repose

Definition of angle of repose 

1 physics : the angle that the plane of contact between two bodies makes with the horizontal when the upper body is just on the point of sliding : the angle whose tangent is the coefficient of friction between the two bodies

2 or angle of rest : the angle of maximum slope at which a heap of any loose solid material (as earth) will stand without sliding — compare angle of slide

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First Known Use of angle of repose

1807, in the meaning defined at sense 1

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The first known use of angle of repose was in 1807

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