The Netherlands had 5 times more windmills in 1850 than it has wind turbines today. Article also available in French & Spanish.. More than 900 years ago, medieval Europe became the first large civilisation not to be run by human muscle power.
In the grinding process, materials are reduced in size by fracturing them. The mechanism of fracture is not fully understood, but in the process, the material is stressed by the action of mechanical moving parts in the grinding machine and initially the stress is absorbed internally by the material as strain energy.
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