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In mathematics , specifically in topology , a surface is a two-dimensional topological manifold . The most familiar examples are those that arise as the boundaries of solid objects in ordinary three-dimensional Euclidean space R 3 — for example, the surface of a ball . On the other hand

Surface tension print that page


Surface tension has the dimension of force per unit length , or of energy per unit area . The two are equivalent—but when referring to energy per unit of area, people use the term surface energy —which is a more general term in the sense that it applies also to solids and not just liquids

Surface mining print that page


Surface mining began in the mid-sixteenth century [ 1 ] and is practiced throughout the world, although the majority of surface mining occurs in North America [ 2 ] . It gained popularity throughout the 20th century, and is now the predominant form of mining in coal beds such as those in

Microsoft Surface print that page


Surface has been optimized to respond to 52 touches at a time. During a demonstration with a reporter, Mark Bolger, the Surface Computing group's marketing director, "dipped" his finger in an on-screen paint palette, then dragged it across the screen to draw a smiley face . Then he used all

Surface runoff print that page


Surface runoff can be generated either by rainfall or by the melting of snow, or glaciers. Snow and glacier melt occur only in areas cold enough for these to form permanently. Typically snowmelt will peak in the spring and glacier melt in the summer, leading to pronounced flow maxima in

Surface reconstruction print that page


In an ideal infinite crystal, the equilibrium position of each individual atom is determined by the forces exerted by all the other atoms in the crystal, resulting in a periodic structure. If a surface is introduced to the system by terminating the crystal along a given plane, then these forces

Road surface marking print that page


Road surface markings are used on paved roadways to provide guidance and information to drivers and pedestrians. Uniformity of the markings is an important factor in minimizing confusion and uncertainty about their meaning, and efforts exist to standardise such markings across borders. However

Surface plate print that page

A surface plate is a solid, flat plate used as the main horizontal reference plane for precision inspection, marking out (layout), and tooling setup. The surface plate is often used as the baseline for all measurements to the workpiece, therefore one primary surface is finished extremely

wikipedia.org | 2011/9/20 2:32:43

Surface-to-air missile print that page


A surface-to-air missile ( SAM ) or ground-to-air missile ( GTAM ) is a missile designed to be launched from the ground to destroy aircraft or other missiles. It is one type of anti-aircraft system ; in modern armed forces missiles have replaced most other forms of dedicated anti-aircraft

Surface charge print that page

Surface charge density is defined as the amount of electric charge , q, that is present on a surface of given area, A [ 2 ] : [ edit ] Conductors According to Gauss’s law , a conductor at equilibrium carrying an applied current has no charge on its interior. Instead, the entirety of the

wikipedia.org | 2011/8/15 19:47:06