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A pump is a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical action, typically converted from electrical energy into hydraulic energy. Pumps can be classified into three major groups according to the method they use to move the fluid: direct lift, displacement, and gravity pumps.

Pumps operate by some…[Leggi tutto]

Except for oxygen, hydrogen can be account for another important gas in the world. Hydrogen is the most abundant element in the Universe, although in its gaseous state it does not naturally occur on Earth and must be manufactured. In industry, H2(g) is produced on a large scale by a process called steam reforming, to separate carbon and hydrogen…[Leggi tutto]

Bulldozer, also called Dozer, powerful machine for pushing earth or rocks, used in road building, farming, construction, and wrecking; it consists of a heavy, broad steel blade or plate mounted on the front of a tractor. Sometimes it uses a four-wheel-drive tractor, but usually a track or crawler type, mounted on continuous metal treads, is…[Leggi tutto]

Pump, a device that expends energy in order to raise, transport, or compress fluids. The earliest pumps were devices for raising water, such as the Persian and Roman waterwheels and the more sophisticated Archimedes screw (q.v.).

The mining operations of the Middle Ages led to development of the suction (piston) pump, many types of…[Leggi tutto]

Thirdly, leotards are okay if you are a super hero or playing one for Halloween. Superman, Batman, and many other comic book superheroes made the Compression Tights okay. Its sleek tight fit make for a great outfit when fighting crime. No extra fabric to get snagged and nothing to resist wind as you fly or run at the speed of light. If you…[Leggi tutto]

Do you have a patio or garden in your house? Then a comfortable chair will be necessary. Rattan is a type of climbing or trailing vine-like palm native to the tropical jungles of Asia, Malaysia, and China. One of the largest sources has been the Philippines. Rattan can be identified by its tough, solid stems that vary from 1 to 2 inches in…[Leggi tutto]