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Chapter 9 (1).notebook
1
January 29, 2014
Chapter 9 (1).notebook
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January 29, 2014
Pneumatic Systems
A gas is used to exert a force on the gas in an enclosed space.
Compressors are necessary as gases can be compressed. They build up the air pressure, and then when the pressure is released, a strong, steady force is created.
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Video clips!
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Pascal's Law
Pressure applied to an enclosed fluid is transmitted with equal force throughout the entire container.
This is the principle behind hydraulic and pneumatic systems.
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Examples of Pascal's Law:
car lift or hoist hydraulic jack automobile braking system air compressors automobile/bicycle tires
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Pressure and Volume
Increasing the pressure on a gas results in a decrease in volume when temperature is held constant.
Increasing the temperature of a gas results in an increase in volume when pressure is held constant.
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Increasing the temperature of a gas results in an increase in pressure when volume is held constant.
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Examples that illustrate the relationship among pressure, volume and temperature when gaseous fluids are compressed or heated:
1) Propane Cylinders
(increase in pressurewith a decrease involume at constanttemperature)(ii) heating an aerosolpressure volume
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When the propane is inside the tank it is under pressure, which causes it to be a liquid. When you release the pressure (open the valve), the liquid evaporates and comes out as a gas.
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2) Aerosol can
temperature pressure