Pressure:
Pressure Pressure ( p or P ) is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. [2] Various units are there for expressing 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 meter (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. We can express pressure in terms of standard atmospheric pressure; the unit atmosphere (atm) is this pressure, and the torr is 1⁄760 of this value. The pressure exerted by particle collisions inside a closed container. The collisions that exert the pressure are highlighted in red. [1] Manometric units, such as the centimeter of water, millimeter of mercury, inch of mercury, etc., are units of pressure in terms of the height of a column of a particular fluid in a manometer. Mercury co