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.

Billy Joel

William Martin "Billy" Joel (born May 9, 1949) is an American pianist, singer-songwriter, and composer. Since releasing his first hit song, "Piano Man", in 1973, Joel has become the sixth-best-selling recording artist and the third-best-selling solo artist in the United States. His compilation album Greatest Hits Vol. 1 & 2 is one of the best-selling albums in the US.

Joel had Top 40 hits in the 1970s, 1980s, and 1990s, achieving 33 Top 40 hits in the US, all of which he wrote himself. He is also a six-time Grammy Award winner who has been nominated for 23 Grammy Awards. He has sold more than 150 million records worldwide, making him one of the best-selling artists of all time.

Joel was inducted into the Songwriters Hall of Fame (1992), the Rock and Roll Hall of Fame (1999), and the Long Island Music Hall of Fame (2006). In 2001, Joel received the Johnny Mercer Award from the Songwriters Hall of Fame. In 2013, Joel received the Kennedy Center Honors, the nation's highest honor for influencing American culture through the arts. With the exception of the 2007 songs "All My Life" and "Christmas in Fallujah", Joel stopped writing and releasing pop/rock material after 1993's River of Dreams. However, he continues to tour, and he plays songs from all eras of his solo career in his concerts.

Under Pressure

"Under Pressure" is a 1981 song originally recorded by Queen and David Bowie, and later included on Queen's 1982 album Hot Space. The song reached number one on the UK Singles Chart, becoming the group's second number-one hit in their home country (after 1975's "Bohemian Rhapsody", which topped the chart for nine weeks), and Bowie's third UK number-one. It was also number 31 on VH1's 100 Greatest Songs of the '80s.

The song was played live at every Queen concert from 1981 until the end of Queen's touring career in 1986. It is recorded on the live albums Queen Rock Montreal and Live at Wembley '86. The song was included on some editions of Queen's first Greatest Hits compilations, such as the original 1981 Elektra release in the US. It is included on the band's compilation albums Greatest Hits II, Classic Queen, and Absolute Greatest as well as Bowie compilations such as Best of Bowie (2002) and Nothing Has Changed (2014).

Creation