Re: "tipping point"

Going back to wiki for clarification:

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Angle of repose
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For the Wallace Stegner novel, see Angle of Repose.
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 forms 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 or silo to store the material. It can also be
used to size a conveyor belt for transporting the material.

There are numerous methods for measuring angle of repose and each
produces slightly different results. Results are also sensitive to the
exact methodology of the experimenter. As a result, data from different
labs is not always comparable.

An alternative measurement, useful for many of the same purposes, is
testing with a shear cell.


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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.
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Retrieved from "http://en.wikipedia.org/wiki/Angle_of_repose";

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