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Measuring pressure

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Aims Describe the simple mercury barometer and its use in measuring atmospheric pressure Use and describe the use of a manometer

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The manometer A manometer measures pressure difference.

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**Atmospheric pressure Gasses are also fluids**

The atmosphere is made of gasses The atmosphere exerts a pressure Equal to Density changes so must use average

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**Using atmospheric pressure**

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Pressure from the air

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**The mercury barometer Torricelli filled a tube with**

mercury and inverted it into an open container of mercury. Air pressure Po acting on the mercury in the dish can support a column of mercury 76 cm in height.

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**Standard atmospheric pressure**

The pressure that will support a column of mercury of mm heigh is known as standard atmospheric pressure or 1 atmosphere (1 atm). 1 atm = 76 cmHg = x 105 Pa = 103 millibar (mb)

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Pressure from the air As the air is removed from the inside the external pressure crashes the can.

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**Uses of pressure in fluids**

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Hydraulic jack The hydraulic press is an important application of Pascal’s Principle.

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**Hydraulic Brakes Brake pedal. Master cylinder. Break fluid.**

Slave cylinder. Large piston. Brake disc. Tyre.

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**Why are the walls of a dam wider at the bottom than at the top?**

It is cheaper to build Gravity increases with depth Pressure increases with depth Looks nice

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**A pressure of 600 Pa acts over an area of 2m2**

A pressure of 600 Pa acts over an area of 2m2. What force creates this pressure? 1 200 N 300 N 1 200 Pa 300 Pa

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Pressure and Pascal’s Principle. PRESSURE! FORCE.

Pressure and Pascal’s Principle. PRESSURE! FORCE.

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