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SHIMI .SB.Ed

PHYSICAL SCIENCE

PRESSURE

PRESSURE

Pressure is the amount of force acting per unit area. The symbol of pressure is p.

P=F/A

Unit=pascal

Formula ,

1. LIQUID PRESSURE

2. ATMOSPHERIC PRESSURE

There are two types of pressure

LIQUID PRESSURE

Liquid pressure is the increase in pressure at increasing depth in a liquid .This pressure increases because the liquid at the lower depths has to support all of the water above it.

Liquid pressure=mass * acceleration due to density * depth in liquid

If there is a hole in the containers surface then liquid will initially flow our perpendicular to the surface.

ATMOSPHERIC PRESSURE

Atmospheric pressure is defined as the force per unit area exerted against a surface by the weight of the air above that surface.

Atmospheric pressure is used in many of the things , for example

When we drink water with a straw, while sucking our lungs expand and air in the drinking straw goes into them . The air pressure in the straw decreases and the atmospheric pressure acting on the surface of water . Then forces the water to move up inside the straw and into our mouth.

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