2.19 confined fluids under pressure pages 124-125
TRANSCRIPT
2.19 Confined Fluids Under Pressure Pages 124-125
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 Work
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
Gas Liquid
Device toReduceVolume
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 closertogether.
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 inmore of the fluid into the container. As we cramin more stuff (under pressure) the fluid may turnto 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.
Liquid Gas
Read pp. 124-125 if you need more information to answer the following questions.
• Questions:
page 125 # 1, 2, 3, 4, 5, 7