PRESSURE IN

LIQUIDFORM 4 SYALLBUSMINISTRY OF EDUCATION MALAYSIA

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Notes

Characteristic of pressure in liquid

Increases with depth

Acts in all direction

Does not depends on the area of its surface

Does not depends on the shape or size of the

container

The pressure at two point at the same level in the same

liquid are equal

Application of Pressure In Liquids

Submarine is built with thick wall so as to withstand enormous pressure at greater depth.

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Application of Pressure In Liquids

Normally a water tank is places at higher level so as to supply water at greater pressure.

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What Is Pressure In Liquid ??

A liquid in a container exerts pressure because of its weight..

The pressure at any point in a liquid acts in all directions.

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Pressure acts equally in all directions at any points in a liquid at a particular

depth.

Does not depend on the area of its

surface

Does not depend on the shape or

size of the container.

CHARACTERISTICS

• A diver experiences discomfort in his body and ears when he dives deep underwater.

• Why does this happen?

Pressure In Liquids

The pressure at two points at the same level in the same liquid are equal

When the container is drilled with several identical holes at the same height, water will spurt out at equal speeds to reach equal distances from the circumference of the base.

The pressure in a liquids acts in all directionIf the thistle funnel, bent at different angles is placed at the same depth y, the manometer will indicate the same reading h. A liquid exerts a pressure on every surface in contact with it regardless which way the surface is facing.

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Relate depth to pressure in a liquid

• Pressure in liquid increase with depth

• pressure α depth.

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Relate density to pressure in a liquid

• Pressure α liquid density

• Eg : density of oil is less than water. Hence, pressure of oil is also less

The pressure in a liquid does not

depend on the shape or size of the container

The diameters and shapes of the tubes are different. The pressure at the same depth is the same since the water levels in each tube is the same.

Formula For The Pressure In A Liquid

Liquid Pressure Formula

Size, shape of container does not affect the pressure acting on the

liqud

• Pressure in liquid increase with depth

• pressure α depth.

Depth