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North Carolina School of Science and Mathematics

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The most remarkable thing about this expression is what it does not include. The fluid pressure at a given depth does not depend upon the total mass or total volume of the liquid. The above pressure expression is easy to see for the straight, unobstructed column, but not obvious for the cases of different geometry which are shown.

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aneroid barometer facts, information, pictures | Encyclopedia.com articles about aneroid barometer

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Get information, facts, and pictures about aneroid barometer at Encyclopedia.com. Make research projects and school reports about aneroid barometer easy with credible articles from our FREE, online encyclopedia and dictionary.

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Barometer: Barometer, device used to measure atmospheric pressure. Because atmospheric pressure changes with distance above or below sea level, a barometer can also be used to measure altitude. There are two main types of barometers: mercury and aneroid. In the mercury barometer, atmospheric pressure balances

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14. MEASUREMENT OF ATMOSPHERIC PRESSURE 

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14. MEASUREMENT OF ATMOSPHERIC PRESSURE 

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Quick Answer

Air pressure is measured by using a barometer, the value of which is given in varying units, including inches of mercury (in Hg) or millimeters of mercury (mm Hg), torr (Tor), bar or millibars (mb), pounds per square inch (psi) and pascal (Pa). Standard atmosphere, which refers to the sea-level atmospheric pressure at 0 degree Celsius, is expressed in atmospheres, commonly abbreviated to atm. One atm is equal to 29.92 in Hg, 760 mm Hg, 760 Tor, 1.013 bar, 1,013.25 mb, 14.7 psi and 101,325 Pa.
Continue Reading

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Air pressure is measured by using a barometer, the value of which is given in varying units, including inches of mercury (in Hg) or millimeters of mercury (mm Hg), torr (Tor), bar or millibars (mb), pounds per square inch (psi) and pascal (Pa).

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atmospheric pressure, also called barometric pressure, force per unit area exerted by an atmospheric column (that is, the entire body of air above the specified area). Atmospheric pressure can be measured with a mercury barometer (hence the commonly used synonym barometric pressure), which indicates the height of a column of mercury that exactly balances the weight of the column of atmosphere over the barometer. Atmospheric pressure is also measured using an aneroid barometer, in which the sensing element is one or more hollow, partially evacuated, corrugated metal disks supported against collapse by an inside or outside spring; the change in the shape of the disk with changing pressure can be recorded using a pen arm and a clock-driven revolving drum.

Atmospheric pressure is expressed in several different systems of units: millimetres (or inches) of mercury, pounds per square inch (psi), dynes per square centimetre, millibars (mb), standard atmospheres, or kilopascals. Standard sea-level pressure, by definition, equals 760 mm (29.92 inches) of mercury, 14.70 pounds per square inch, 1,013.25 × 10 ³ dynes per square centimetre, 1,013.25 millibars, one standard atmosphere, or 101.325 kilopascals. Variations about these values are quite small; for example, the highest and lowest sea-level pressures ever recorded are 32.01 inches (in the middle of Siberia) and 25.90 inches (in a typhoon in the South Pacific). The small variations in pressure that do exist largely determine the wind and storm patterns of Earth.

Near Earth's surface the pressure decreases with height at a rate of about 3.5 millibars for every 30 metres (100 feet). However, over cold air the decrease in pressure can be much steeper because its density is greater than warmer air. The pressure at 270,000 metres (10 −6 mb) is comparable to that in the best man-made vacuum ever attained. At heights above 1,500 to 3,000 metres (5,000 to 10,000 feet), the pressure is low enough to produce mountain sickness and severe physiological problems unless careful acclimatization is undertaken.

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Atmospheric pressure | Definition & Variation

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Atmospheric pressure, force per unit area exerted by an atmospheric column (the entire body of air above the specified area). It is expressed in several different systems of units, including millimeters (or inches) of mercury, pounds per square inch (psi), millibars (mb), or standard atmospheres.

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BETTER UNDERSTANDING

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9. Do you Know                   What is Hydraulic Press? 

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9. Do you Know                   What is Hydraulic Press? 

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Hydraulic Press Hydraulic Press is one of the applications of Pascal's Law. Joseph Bramah designed the hydraulic press in1795. In a hydraulic press, a small force applied on a column of liquid is converted into a much greater force available to another column of liquid connected to the first.

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8. How it works ???   -               Application of Pascal's law 

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8. How it works ???   -               Application of Pascal's law 

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A hydraulic system is a device in which a small applied force can give rise to a larger force.

The principle in the hydraulic system is widely used in jacks, vehicle brake systems, hydraulic presses and heavy machinery and a few more examples which you can find (for yourself)

Hyraulic Jacks
Hydraulic jacks are used to lift a heavy load such as when changing a car tyre. When the handle is pressed down, a valve closes and the small piston forces hydraulic fluid through another valve to the larger cylinder. The pressure transmitted results in a large force on the load.

When the handle is raised, valve B closes and hydraulic fluid flows from the buffer tank through valve A into the small cylinder. The handle is moved up and down repeatedly until the load is sufficiently lifted up.

The large piston can be lowered at the end by opening the release valve to allow all the hydraulic fluid to flow back into the buffer tank.

Hydraulic Brakes

Hydraulic brakes are used in cars, lorries and motorcycles.

In a hydraulic brake system, a liquid, known as brake fluid,
is used to transmit pressure from the brake pedal to all the wheels of the vehicle.

When the brake pedal is pressed, the piston of the control cylinder applies a pressure on the brake fluid and this pressure is transmitted, via a system of pipes, to each cylinder at the wheels.

The cylinder at the wheels cause a pair of pistons to push a pair of friction pads to press against the surface of the brake discs or brake drums. The frictional forces between these brake components cause the vehicle to slow down and stop.

When the brake pedal is released, a spring restores the brake discs to their original positions.

Hydraulic Pumps

Hydraulic pumps are used to raise cars in a motor workshop.

The machine is equipped with a small cylinder connected to a large cylinder. Both cylinders are filled with oil.

Compressed air is introduced into the small cylinder in which the compressed air exerts a pressure on the surface of the oil.

This pressure is transmitted by the oil to the large cylinder where the pressure acts on a large piston to produce a force which is large enough to lift a car.

Hope this helps!

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Applications of Pascal's Principle in Everyday Life

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A hydraulic system is a device in which a small applied force can give rise to a larger force. The principle in the hydraulic system is widely used in jacks, vehicle brake systems, hydraulic presses and heavy machinery and a few more examples which you can find (for yourself) Hyraulic Jacks Hydraulic jacks are used to lift a heavy load such as when changing a car tyre.

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. Read through and answer -  Pascal's Law 

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. Read through and answer -  Pascal's Law 

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Pascal's law and a simple example, and how fluid pressure is used.

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

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A video explaining about Fluid Pressure for 8th class (grade) CBSE science students in India. For many more such videos and complete customized solutions to schools and students on a wide range of devices, please contact sales@edewcate.com EzyLearn Digiclass is the most advanced digital curriculum software in the country that enables teachers and students to communicate and derive maximum benefit out of the vast digital resources made avaialable to them at the lowest price in the market.

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People who wear stiletto heels are asked not to walk on soft floors Snow shoes stop you sinking through soft snow The lunar landers were fitted with large foot pads Tractors that have to work on soft ground are fitted with wide tyres The police can get an idea of heavy a burglar might be by looking at their footprints When you use a car jack on soft tarmac put a flat board underneath it Some buildings on soft ground are built on concrete rafts There is a lizard that can run over the surface of water

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Read Through

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Definition of Pressure