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The angle of repose is an engineering property of particulate solids. When bulk particles are poured onto a horizontal surface, a conical pile will form. The angle between the edge of the pile and the horizontal surface is known as the angle of repose and is related to the density, surface area, and coefficient of friction of the material. Material with a low angle of repose tends to form flatter piles than material with a high angle of repose.This property is sometimes used in the design of equipment for the processing of particulate solids. For example, it may be used to design an appropriate hopper to store the material.
The angle of repose is one of the Carr Indices .
The angle of repose is sometimes used as a synonym for the tipping point. To understand the origin of the term, consider a person who leans back in a chair. If the person tips back beyond a certain angle, then the chair will tip over and the person will fall onto his or her back. That angle is the angle of repose, and it is analogized to apply to any process in which beyond a certain point, the rate at which the process ( chemical, sociological, etc.) proceeds increases dramatically. Mathematically, the angle of repose may be seen as an inflection point.
Angle of Repose is also a 1971 novel by Wallace StegnerWallace Stegner ( 1909- 1993) was an American novelist and environmentalist. Called by some the "The Dean of Western Writers. He grew up in northern Montana and southern Saskatchewan, about which he writes in his novel/autobiography Wolf Willow''. He rece.
