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This animated science topic "Pressure" is related to force and area that seem a macroscopic quantity, but pressure in microscopic physical aspect is collision between molecules. pressure exists everywhere, at times we dont even feel it, like the atmospheric pressure on our bodies. To understand pressure we have to look minutely at things --- at molecular level

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 Category : Science Type : animation Total animation length: 45 minutes Animation type : Advanced animation contains details about Pressure in every day life- experiencing pressure What is pressure? How atmosphere generates pressure? Experiment to show air generates pressure Why atmospheric pressure decreases with increase in altitude? Understanding concept of pressure - two examples more about pressure in explanatory notes Atmospheric pressure and climate Measurement of atmospheric pressure
Snapshots
 Pressure as force /area Application of pressure Atmosphere exerts a pressure on us Application of pressure - skating is possible due to pressure only Molecules exert pressure Atmospheric pressure is due to air in atmosphere exerting pressure on us Weight and pressure
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Why is it difficult to cut a fruit using a blunt knife? Why drawing pins have flattened heads? On blowing why does a rubber balloon swells? The answers to all these questions are related to the effect of a force applied on a surface. This effect is termed as pressure.

Pressure is the force acting on an unit area of the surface in a direction perpendicular to it.
Pressure =

Perpendicular contact force (Newton N)
--------------------------------------------
surface area of contact (square meter or m2)

The S.I unit of pressure is Pascal( N/m2 )

When the force of one Newton acts on an area of one square meter, the pressure on that surface is said to be one Pascal.

Thus

1.Pressure is directly proportional to force
on same contact area.
2. Pressure is inversely proportional to surface area

i.e. When same force is applied on different areas, greater is the pressure for smaller contact area while smaller is the pressure for larger contact area.
Similarly when different forces are applied on the same surface area, greater the magnitude of force greater is the pressure.

Though force is a vector quantity pressure is a scalar quantity since it is independent of direction.

All things on earth are constantly hit by large number of air molecules present on the surface of earth (the envelope of air extends up to 320 miles).
These molecules though invisible have weight and cumulatively exert pressure on all things on earth. The pressure exerted by these air molecules is called as Atmospheric pressure. The atmospheric pressure at a place is the weight of a column of air over a unit area of the earth's surface at that place.

Atmospheric pressure decreases with increase in altitude. This is because the number of air molecules i.e. air density decreases at higher altitudes.

At higher altitudes due to weak gravitational force, the cumulative force exerted by the air molecules on an object decreases and hence atmospheric pressure decreases.

When a rubber balloon is blown into, it swells in all directions and takes a rounded shape. This happens because as one blows into a balloon, air molecules are injected into it. These molecules while moving randomly around the space collide with the skin of the balloon and thus exert pressure in all directions. This pressure acts perpendicular to the surface and helps the balloon to swell and take a round shape.

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