This measurement represents the steepest angle of descent or dip relative to the horizontal plane to which a material can be piled without slumping. It is determined by gradually pouring material onto a horizontal surface until a conical pile forms and then carefully measuring the angle between the side of the cone and the horizontal surface. For instance, dry sand typically exhibits a different measurement than wet sand due to the cohesive forces introduced by moisture.
Accurate determination of this value is crucial across various industries. It is vital in the design of storage silos and hoppers, predicting the stability of slopes and embankments in civil engineering projects, and optimizing the handling of granular materials in pharmaceutical and agricultural sectors. Historically, understanding this characteristic has been essential for safe and efficient material storage and transport, preventing collapses and ensuring structural integrity.