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-as of [10 JUNE 2026]-
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“air pressure”
“sound pressure”
*symbol* –>
p
P
-“pressure” 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 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 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’)
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