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Pressure is the force per unit area.

This means that the pressure a solid object exerts on another solid surface is its weight in newtons divided by its area in square metres.

where:

p is the unit of pressure in pascals. One pascal is 1 N/m²

f is the unit of force in newtons

a is the unit of area in m²

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http://www.bbc.co.uk/education/guides/zrcmn39/revision

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Fluid pressure is the pressure at some point within a fluid.

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1}If we try to cut a fruit with the flat side the force is distributed over a large area and it will not cut. But if we use the edge, it will cut smoothly. The reason is that the flat side has a greater surface area (less pressure) and so it does not cut the fruit. When we take the thin side, the surface area is reduced and so it cuts the fruit easily and quickly.

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1.The depth the pressure is measured at.
2.The density of the fluid.
3.The acceleration due to gravity.

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SPM - Physics- Form 4 Chapter 3 : Forces and Pressure 3.2 Pressure in liquids

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An increase in the number of gas molecules in the same volume container increases pressure.

A decrease in container volume increases gas pressure.

An increase in temperature of a gas in a rigid container increases the pressure.

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Describes factors that affect gas pressure.

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Why is CNG compressed?
CNG is made by compressing natural (which is mainly composed of methane, CH₄), to less than 1 percent of the volume it occupies at standard atmospheric pressure. It is stored and distributed in hard containers at a pressure of 20–25 MPa (2,900–3,600 psi), usually in cylindrical or spherical shapes.

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SI Unit : Pascal
CGS: Barye
Other Units
Torr
Millibar
Atmosphere

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Many techniques have been developed for the measurement of pressure and vacuum. Instruments used to measure and display pressure in an integral unit are called pressure gauges or vacuum gauges. A manometer is a good example as it uses a column of liquid to both measure and indicate pressure.