Gravity Feed
Gravity feed is the use of earth's gravity to move something (usually a liquid) from one place to another. It is a simple means of moving a liquid without the use of a pump. A common application is the supply of fuel to an internal combustion engine by placing the fuel tank above the engine, e.g. in motorcycles, lawn mowers, etc. A non-liquid application is the carton flow shelving system. Ancient Roman aqueducts were gravity-fed, as water supply systems to remote villages in developing countries often are. In this case the flow of water to the village is provided by the hydraulic head, the vertical distance from the intake at the source to the outflow in the village, on which gravity acts; while it is opposed by the friction in the pipe which is determined primarily by the length and diameter of the pipe as well as by its age and the material of which it is made. See also * Siphon A siphon (from grc, σίφων, síphōn, "pipe, tube", also spelled nonetymologically syph ...
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Segovia - Roman Aqueduct (2687841356)
Segovia ( , , ) is a city in the autonomous community of Castile and León, Spain. It is the capital and most populated municipality of the Province of Segovia. Segovia is in the Inner Plateau (''Meseta central''), near the northern slopes of the Sistema Central range and on a bend of the Eresma river. The city is famous for its historic buildings including three main landmarks: its midtown Roman aqueduct, its cathedral (one of the last ones to be built in Europe following a Gothic style), and the medieval castle, which served as one of the templates for Walt Disney's Cinderella Castle. The city center was declared of World Heritage by UNESCO in 1985. Etymology The name of Segovia is of Celtiberian origin. Although historians have linked its old name to ', the recent discovery of the original Roman city in the nearby village of Saelices discarded this possibility. The name of "Segovia" is mentioned by Livy in the context of the Sertorian War. Under the Romans and Moors, the ...
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Earth's Gravity
The gravity of Earth, denoted by , is the net acceleration that is imparted to objects due to the combined effect of gravitation (from mass distribution within Earth) and the centrifugal force (from the Earth's rotation). It is a vector quantity, whose direction coincides with a plumb bob and strength or magnitude is given by the norm g=\, \mathit\, . In SI units this acceleration is expressed in metres per second squared (in symbols, m/ s2 or m·s−2) or equivalently in newtons per kilogram (N/kg or N·kg−1). Near Earth's surface, the gravity acceleration is approximately , which means that, ignoring the effects of air resistance, the speed of an object falling freely will increase by about per second every second. This quantity is sometimes referred to informally as ''little '' (in contrast, the gravitational constant is referred to as ''big ''). The precise strength of Earth's gravity varies depending on location. The nominal "average" value at Earth's surface, known ...
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