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    Cast Iron Manufacturing

    Cast iron has become a synonym for durability — a cast iron stomach, a cast iron alibi. As metals go, however, it is actually something of a Brunswick stew. While the pig iron that forms the basis for cast iron is being melted, scrap iron and steel are often thrown into the mix.

    When the process is complete and impurities such as sulfur are subtracted, the end product is actually only 95 percent iron. The rest of the chemical makeup is primarily carbon and silicon, in various percentages. Anything over two percent silicon is known as "gray cast iron," while a lesser amount gives birth to "white cast iron." White cast iron is not actually white, but gets its name from a reaction with the increased carbon that creates small white deposits of cementite on an otherwise dark surface.

    Aqueduct

    An aqueduct is an artificial channel through which water is transferred from one place to another. Aqueducts can be made of many different types of materials, such as brick, concrete, metal or wood, and constructed in a variety of ways, for instance as tunnels, canals or bridges. An aqueduct can transport a small amount of water as well as a large enough amount that watercraft can even be transported through it, and the water can be moved through the use of pumps or simply by gravity.

    Air Conditioning Systems

    Air conditioning is a term referring to any process or system that controls the temperature, humidity, cleanliness, and movement of indoor air. When the weather is hot, it cools the air. When the weather is cold, it warms the air. It also adds or removes moisture to and from the air as needed. By controlling air movement, air conditioning is able to remove dust and dirt by bringing fresh air into a space and pushing stale air out. An air conditioning system is any mechanism designed to stabilize and control the condition of the air in a given space, most commonly in buildings, cars, and other forms of public and private transportation.

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