cover image


Force distributed over an area / From Wikipedia, the free encyclopedia

Dear Wikiwand AI, let's keep it short by simply answering these key questions:

Can you list the top facts and stats about Pressure?

Summarize this article for a 10 year old


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.[1]:445 Gauge pressure (also spelled gage pressure)[lower-alpha 1] is the pressure relative to the ambient pressure.

Quick facts: Pressure, Common symbols, SI unit, In SI...
Common symbols
p, P
SI unitpascal (Pa)
In SI base unitskgm−1s−2
Derivations from
other quantities
p = F / A
DimensionM L−1 T−2
A figure showing pressure exerted by particle collisions inside a closed container. The collisions that exert the pressure are highlighted in red.
Pressure as exerted by particle collisions inside a closed container

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 (N/m2); similarly, the pound-force per square inch (psi, symbol lbf/in2) 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 1760 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.

Oops something went wrong: