Pressure

Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Gauge pressure (also spelled gage pressure) is the pressure relative to the ambient pressure.

Various units are used to express pressure. Some of these derive from a unit of force divided by a unit of area; the SI unit of pressure, the pascal (Pa), for example, is one newton per square metre; similarly, the pound-force per square inch (psi) is the traditional unit of pressure in the imperial and US customary systems. Pressure may also be expressed in terms of standard atmospheric pressure; the atmosphere (atm) is equal to this pressure and the torr is defined as ¹⁄₇₆₀ of this. Manometric units such as the centimetre of water, millimetre of mercury and inch of mercury are used to express pressures in terms of the height of column of a particular fluid in a manometer.

Definition

Pressure is the amount of force acting per unit area. The symbol for pressure is p or P. The IUPAC recommendation for pressure is a lower-case p. However, upper-case P is widely used. The usage of P vs p depends on the field in which one is working, on the nearby presence of other symbols for quantities such as power and momentum, and on writing style.

Pressure (disambiguation)

Pressure is an effect which occurs when a force is applied on a surface.

Pressure also may refer to:

Music

Entertainment

Other uses

See also

Billy Ocean

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Billy Ocean (born Leslie Sebastian Charles; 21 January 1950) is a Trinidadian-born English recording artist who had a string of R&B international pop hits in the 1970s and 1980s. He was the most popular British R&B singer-songwriter of the early to mid-1980s. After scoring his first four UK Top 20 successes, seven years passed before he accumulated a series of transatlantic successes, including three U.S. number ones. In 1985, Ocean won the Grammy Award for Best Male R&B Vocal Performance for his worldwide hit, "Caribbean Queen", and in 1987 was nominated for the Brit Award for Best British Male Artist.

In 2002, the University of Westminster, London, awarded Ocean an honorary doctorate of music. In 2010, Ocean was presented with the Lifetime Achievement Award at the MOBO Awards. On 29 July 2011, Ocean became a Companion of the Liverpool Institute for Performing Arts, presented to him by Sir Paul McCartney. He is a member of the Rastafari movement.

Mocha

Mocha may refer to:

Coffee

Places

Geography

Settled places

People

Art, entertainment, and media

Software

Other uses

Cyclophora annularia

The Mocha (Cyclophora annularia) is a moth of the Geometridae family. The species can be found in Europe. Their wingspan is 18 millimetres (0.71 in) to 22 millimetres (0.87 in). Adults are on wing from May to August depending on the location. The larvae feed on Maple tree leaves.

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Mocha Island

Mocha (Spanish: Isla Mocha) is a small Chilean island located west of the coast of Arauco Province in the Pacific Ocean. The island is approximately 48 km² (19 sq mi) in area, with a small chain of mountains running roughly in north-south direction. In Mapuche mythology, the souls of dead people travel west to visit this island. The island today is home to the Mocha Island National Reserve, a nature reserve that covers approximately 45% of the island's surface. The island is noted as the location of numerous historic shipwrecks. The waters off the island are a popular place for recreational sea fishing.

History

The island was historically inhabited by an indigenous coastal population of Mapuches known as the Lafkenches. It was discovered by Juan Bautista Pastene September 10, 1544, and named Isla de San Nicolas de Tolentino.

According to Juan Ignacio Molina, the Dutch captain Joris van Spilbergen observed the use of chilihueques (a South American camelid) by native Mapuches of Mocha Island as plough animals in 1614.