Metal Casting: Sand casting uses ordinary sand as the primary mould material. The sand grains are mixed with small amounts of other materials, such as clay and water, to improve mouldability...
A transistor can be used as a switch and signal amplifier. It is an electronic device with three contacts: the emitter (E), base (B) and collector (C). A very small current on the transistor's base can...
A cement is a binder, a substance used for construction that sets, hardens, and adheres to other materials to bind them together. Cement is seldom used on its own, but rather to bind sand and gravel together....