In chemical engineering and related fields, a unit operation is a basic step in a process. Unit operations involve a physical change or chemical transformation such as separation, crystallization, evaporation, filtration, polymerization, isomerization, and other reactions. For example, in milk processing, homogenization, pasteurization, chilling, ...
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http://en.wikipedia.org/wiki/Unit_operation
(from the article `chemical engineering`) ...of a processing plant encompassing a number of operations, such as mixing, evaporation, and filtration, and of these operations being essentially ...
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http://www.britannica.com/eb/a-z/u/9
(from the article `mining`) The largest open-pit operations can move almost one million tons of material (both ore and waste) per day. In smaller operations the rate may be only ... There are a number of techniques for separating a mass of stone from the parent mass. For many years the primary technique was the wire saw, which ... .....
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http://www.britannica.com/eb/a-z/u/9
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