Fluid+Pressure

 
 * What is a fluid?** "A fluid is a material that can easily flow" (Jones 76). A fluid is also known as a liquid or gas (Jones).

**What is pressure?**  "Pressure is the force exerted on a surface divided by the total area over which the force is exerted" (Jones 75). Pressure's unit of measure is Pascals (Jones).

**What causes fluid pressure?**
==== Fluid pressure is caused by moving particles in fluids as they collide with themselves and any surface they meet. As the particles collide with the surfaces, they exert a force on the surface. Thus, causing fluid pressure (Jones). ====

**Facts:**

 * Particles in a fluid move in all directions, the particles collide with each other with any surface that they meet (Jones).
 * "All of the forces exerted by the individual particles in a fluid combine to make up the pressure exerted by the fluid" (Jones 76).
 * Air pressure occurs because air has mass and exerts pressure (Jones).
 * "Air has weight, and the weight of the air is the force that produces air pressure, or atmospheric pressure" (Jones 76).
 * The equation to find fluid pressure is "P=r*g*h
 * P is the fluid pressure.
 * R is the density of the fluid.
 * G is the acceleration of gravity.
 * H is the height of the fluid above the object" (Hodanbosi).
 * "The pressure of Earth's atmosphere is exerted over the entire surface of your hand" (Jones 77). See the third image below.
 * In a still object, fluid pressure at a defined point, the strength is put forth equally in all directions (Jones).
 * "When a can is full of air, the air pressure inside the can balances the atmospheric pressure outside the can. When air removed from the can, the unbalanced force of the outside air pressure crushes the can" (Jones 77). See the second image below.

In this picture the waves are hitting the rocks causing fluid friction to occur.



Unbalanced Pressure  "A vacuum pump removes the air from a metal can. The pump produces dramatic results in a few moments" (Jones 77).



**Atmospheric Pressure** "The pressure of Earth's atmosphere is exerted over the entire surface of your hand" (Jones 77).

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