FIVE APPLICATION OF LIQUID PRESSURE WITH EXPLANATION
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FIVE APPLICATION OF LIQUID PRESSURE WITH EXPLANATION
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2. we use in syringes
3. when we open a bottle of coke.
4. when we open the tap we find the water gushin out through great pressure
5. its also used in basic hydraulic system
Hydraulic mechanisms are used in the brakes in your car. The force applied on the brake pedal is multiplied on the brake drums. Another use is to jack up a heavy item, like a truck.
Velocity reduces pressure
The scientist Bernoulli discovered that the air pressure in a tube goes down when the velocity of the air in the tube increases. This discovery became known as Bernoulli's Principle.
Used by airplanes
The greatest application of this principle is used in airplanes. The wing of an airplane is usually curved on top and flat on the bottom. This shape is called the airfoil. When the air moves over the curved top portion of the wing or airfoil, it speeds up because of the shape. This lowers the pressure with respect to the bottom part of the wing. Lower pressure on the top results in the lift required to keep the airplane aloft.
The principle is so simple, but not very obvious.
Flying upside-down
But if the airfoil gives lift, how can an airplane fly upside down?
If the airplane is going fast enough, other factors influence the lift. When the plane is upside-down, it is really flying at a slight angle, so it is going slightly upward to compensate for the loss of lift.
Some airplanes--such as an airliner--can have great difficulty flying upside down. Usually only smaller stunt planes and military craft can do this maneuver.
Friction reduced
Solids can have rough surfaces. Even microscopic roughness can result in a substantial resistive force of friction when two solids are rubbed together, as well as wear on the parts.
Fluids offer little resistance
On the other hand, a fluid does not have a rough surface and rubbing a solid along a fluid results in little resistive force. Instead of friction, the resistance is due to the thickness or viscosity of the liquid, which affects its ability to move and change its shape.
Used as lubricants
The reduction of friction of two solids can then be achieved by separating them by a layer of a fluid, so the solid surfaces are not in direct contact. This is called lubrication. Water can be used as a lubricant, but it also evaporates quickly. Oils are typically used to lubricate parts and prevent friction, as well as excessive wear from the friction. In some small, high-speed parts, such as the hard-drive of your computer, air is used as a lubricant.
THIS IS BASED ON PASCAL LAW.