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)〔The preferred spelling varies by country and even by industry. Further, both spellings are often used ''within'' a particular industry or country. Industries in British English-speaking countries typically use the "gauge" spelling. Many of the largest US manufacturers of pressure transducers and instrumentation use the spelling "gage pressure" in their most formal documentation (sensotec.com ) Honeywell-Sensotec's FAQ page and (fluke.com ), Fluke Corporation's product search page.〕 is the pressure relative to the local atmospheric or 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 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.
Pressure is the amount of force acting per unit area. The symbol of pressure is ''p'' or ''P''.〔The usage of ''P'' vs ''p'' is context-driven. It 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.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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