2.19 Confined Fluids Under Pressure Pages 124-125.

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Presentation transcript:

2.19 Confined Fluids Under Pressure Pages

What are Confined Fluids? They are fluids that are in a closed system. Examples: Air in Air Mattress Propane in propane tank Paint in Spray Paint Can Blood in the Body

What Happened Here?

When you apply force to one part of a fluid system, it results in movement in another part of that system. This is the basis for hydraulics, pneumatics, etc. The force is transmitted through the fluid to another moveable part, usually some distance away

How Brakes on a Car WorkBrakes The driver pushes down on the brake pedal, which pushes brake fluid through the brake lines towards the wheels. The brake pedal pads are forced against the wheels to stop the car.

Back to the Particle Theory e.g. : Propane inside the propane tanks is liquid propane How do they do this? and WHY? They do this because they can store more in a given area when it is a liquid, and they do this by compressing (increasing pressure) the gas into a liquid Gases, are usually stored as liquids.

How and Why Continued --The Particle Theory GasLiquid

Device to Reduce Volume Gas Liquid

Explanation of How to Compress Gas..... Using the Particle Theory! Gas particles are spread out as far as they can. By compressing them, we are using something to physically move them closer together. We are decreasing the volume of the gas, while leaving the mass the same As the particles are pushed closer and closer together, the attraction between particles occurs, and the fluid is forced into becoming a liquid

Forcing the particles of a gas closer together is called compression The reason we compress gas, is to cram in more of the fluid into the container. As we cram in more stuff (under pressure) the fluid may turn to a liquid.

Gases are very compressible There is a cushion to them, that is why there is a delay in an air filled system…with your syringes it took a brief moment before the plunger on the other side moved. Liquids are only slightly compressible. So we call them incompressible No delay to a water filled system… with your syringes the plunger on the other side moved right away. LiquidGas

Read pp if you need more information to answer the following questions. Questions: page 125 # 1, 2, 3, 4, 5, 7