## Pressure

**PRESSURE
**Topics covered in this video include:

Pressure in solids

Applications of pressure the lift pump

Applications of pressure the force pump

Pressure in liquids

Factors affecting pressure in fluid and derivation of fluid pressure formula

Pascals principle

Applications of pascals principle(Hydraulic lift)

Applications of pascals principle(Hydraulic break system)

Measurement of pressure U tube manometer

Measurement of pressure Mercury barometer

Applications of pressure the bicycle pump and the siphon

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)[a] 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.

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