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Fluids are continuous, shapeless substances
whose molecules move freely past one another and
have the tendency to assume the shape of its
container Liquids or Gasses
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By itself, fluid has no power, but when confined
and placed under pressure,
Fluid can transmit power that can be stored,
directed and made to do work.
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• Fluid Power Systems
• Amplify Power
• Transmit Power
• Control Power

Fluid power is pressurized liquid or gas in a
closed system.
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Fluid power can be hydraulic or pneumatic.
Hydraulics use pressurized oil or other liquids.
Pneumatics use pressurized air or other gasses.
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Blair Pascal was a scientist who lived in the mid
1600s. He described how liquids behave. He
built a container like this to show that water
pressure depends on the depth of the water, not
the size or shape of the container.
A
B
You might think that there is more pressure under
side B, because there is more water, but if it
had more pressure, it would push side A up.
Pascal Law states that pressure at any point in a
body of fluid is the same in every direction,
exerting equal force on equal areas. Now if you
apply more pressure to one side of the container,
the fluid will rise on the other side.
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Read The Basic Idea from How Stuff Works. Push
on the red arrows to see how a simple
hydraulic system works and how we can obtain a
mechanical advantage by changing the size of the
pistons. http//science.howstuffworks.com/hydraul
ic1.htm
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Large movement in the smaller piston requires
less effort, but causes the large piston to
produce a great amount of force.
The force is measured in pounds per square inch.
(psi)
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A piston is a solid cylinder or disk that fits
snugly into a larger cylinder and moves under
fluid pressure, as in a reciprocating engine, or
displaces or compresses fluids, as in pumps and
compressors.
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Fluid Power Applications
Robotics Wave Pool Jaws of Life Cranes
Log Splitters Jack Hammers Auto Lifts Automatic Doors
Auto Brakes On a 1929 Dodge truck Hospital Beds Dump Truck Theme Parks Check out the factory tour!
Animatronics Factories Injection Molders Nail Guns