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ENGINEERING

1.
Engineering is the professional art of applying science to the optimum conversion of the resources of nature to the uses of humankind. The word engine is derived from the Latin root ingenerare, which means «to create». The engines of war were devices such as catapults, floating bridges, and assault towers; their designer was the «engineer», or military engineer. The counterpart of the military engineer was the civil engineer, who applied essentially the same knowledge and skills to designing buildings, streets, water supplies, sewage systems, and other projects.

2. The function of the scientist is to know, while that of the engineer is to do. The scientist adds to the store of verified, systematised knowledge of the physical world; the engineer brings this knowledge to bear on practical problems. Engineering is based principally on physics, chemistry, and mathematics and their extensions into materials science, solid and fluid mechanics, thermodynamics, transfer and rate processes, and systems analysis.

3. Unlike the scientist, the engineer is not free to select the problem that interests him; he must solve problems as they arise; his solution must satisfy conflicting requirements. Usually efficiency costs money; safety adds to complexity; improved performance increases weight. The engineering solution is the optimum solution, the end result that is most desirable. It may be the most reliable within a given weight limit, the simplest that will satisfy certain safety requirements, or the most efficient for a given cost. In many engineering problems the social costs are significant.

4. Engineers employ two types of natural resources - materials and energy. Materials are useful because of their properties: their strength, ease of fabrication, lightness, or durability; their ability to insulate or conduct; their chemical, electrical, or acoustical properties. Important sources of energy include fossil fuels, wind, sunlight, falling water, and nuclear fission. Since most resources are limited, the engineer must concern himself with the continual development of new resources as well as the efficient utilisation of existing ones.

(Encyclopedia Britannica)
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Many engineering solutions should take into account social costs.
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