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Engineering is the application of science, technology, mathematics, art, and practical experience to the design and production of objects, tools or processes. Professional practitioners of engineering are called engineers. Engineers design and build aircraft (Aerospace), roads and buildings (Civil / Structural), computers and electronics (Electrical), machines and vehicles (Mechanical / manufacturing), medical devices (Biomedical), environmental systems (Environmental), agricultural equipment and processes (Agricultural), processing plants, chemicals and molecules (Chemical), new materials (Materials) and much, much more. Without engineering, the world would be a very different place.

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Windmills and Ailsa Craig aka Paddy's Milestone rotated.jpg
The production of renewable energy in Scotland is an issue that has come to the fore in technical, economic, and political terms during the opening years of the 21st century. The natural resource base for renewable energy is extraordinary by European, and even global standards, with the most important potential sources being wind, wave, and tide.

At the end of 2015, there was 7,723 megawatts (MW) of installed renewable electricity capacity in Scotland, an increase of 5.5% (or 406 MW) from the end of 2014. Renewable electricity generation in Scotland was 21,983 GWh in 2015, up 15.2% on 2014. 57.7 per cent of Scotland's electricity came from renewables in 2015. Scottish renewable generation makes up approximately 26.4% of total UK renewable generation (down from 32% in 2014). In 2014, Scotland exported over 24 per cent of generation.

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Air Handler Unit - 5TR
Credit: ArnoldReinhold

A fan is a machine used to create flow within a fluid, typically a gas such as air. The fan consists of a rotating arrangement of vanes or blades which act on the fluid. The rotating assembly of blades and hub is known as an impeller, a rotor, or a runner. Usually, it is contained within some form of housing or case. This may direct the airflow or increase safety by preventing objects from contacting the fan blades. Most fans are powered by electric motors, but other sources of power may be used, including hydraulic motors and internal combustion engines. Fans produce flows with high volume and low pressure (although higher than ambient pressure), as opposed to compressors which produce high pressures at a comparatively low volume. A fan blade will often rotate when exposed to a fluid stream, and devices that take advantage of this, such as anemometers and wind turbines, often have designs similar to that of a fan.

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