Pressure
by Drew L. + Jess J.
Science: Period 6
5/20/11



Table of Contents:
1. Welcome! (Voki)
2. What Is Pressure?
3. Pressure In Fluids
4. Water Pressure In Depth
5. Air Pressure
6. Atmospheric Pressure
7. Balanced Pressure
8. Measuring and Calculating Pressure
9. Difference Between Pressures (Xtranormal)
10. Scuba Diver (Toondoo)
11. Examples (Glogster)


pressure-solid.gif
pressure‑solid.gif




What Is Pressure? When it comes to physics, pressure is the
force exerted on an object's surface divided by the total area of
the forced area. (Pressure, The International Encyclopedia of Science and Technology) The word pressure comes from the term "press''.(Jones 74)
Also the SI unit for pressure is pascal.(Pressure, UXL Encyclopedia of
Science) While force and pressure are related, they're not the same.
The reason because of this is the. The pressure decreases as the area
being forced increases.


underwater-diving.jpg
underwater‑diving.jpg



Pressure In Fluids: Now a fluid as a material that can easily flow, so it can easily move around and often change its shape. One type of fluid is liquids like water, oil, and magma.
Brownian.GIF
C5_Osmosis_3.GIF

There is also gases like air, helium and hydrogen. The particles in fluids move around very fast and often collide with each other. They often hit solid surfaces especially when they are trapped or contained. With every particle hitting the surface, there is a force. But because there can be many particles hitting that surface, all the force together divided by the area of the surface is the total area.

Water Pressure: All fluid pressure depends on depth and elevation. This is especially true when going underwater. The deeper someone swims down, the water pressure increases. So whether it would be a pool, lake,or ocean the same pressure will be felt in 5 meters within the water. This is true in greater depths because there is more weight to support the object. The total pressure at a given point is resulted from the weight of the water plus the air above it. In the deepest part of the ocean, the pressure is work more 1000 times the air pressure we feel.
pressure1.jpg
pressure1.jpg
air_pressure.gif
air_pressure.gif

h1sciQearsPop.gif
h1sciQearsPop.gif

Air Pressure: What makes up our atmosphere? That would be air which is one of many fluids that we live 100 kilometers under. These fluids, or gases press down on everything on Earth's surface. Air exerts pressure because of its mass and every cubic meter of air has pressure because of its mass. So every cubic meter of air pressure is 1 kilogram. Also because of the gravity, the air that's being pushed down has weight. That weight is the force that creates air pressure.

Atmospheric Pressure: Unlike water pressure, the more in depth you are in the air from sea level (or the higher you are) the air pressure decreases. The reason because of this is there is less air above you and therefore less air pressure or atmospheric pressure. That is why you're ears pop when you evaluate higher or lower, because the pressure inside and outside your body are unbalanced which creates pressure. Then your eardrums releases a popping sound. At sea level, atmospheric pressure is about 10.13 N/cm squared.

atmosphere&moon.jpg
atmosphere&moon.jpg

Balanced Pressure: Basically what this concept represents is that Earth's atmosphere is pushing air in all directions. This especially true when air or any fluid is trapped and contained. This allows the pressure to equal itself in all directions. One

hot-air-balloon-atmosphere.jpg
hot‑air‑balloon‑atmosphere.jpg

example is if you were to hold your hand out, you would somewhat be holding air and air would be carrying your hand. The
is because the air around it is being pushed around. However when pressure is unbalanced, it can either be flt or seen. This is why the air around us does not crush us. Thanks to the fluids in our body that give outward pressure, the pressure around us is balanced. This why the air around it is being pushed in all directions, because of the inward equal pressure around the hand and the outward inside the hand. Balanced Pressure is why we can't feel stationary air.




Calculating & Measuring Pressure: Much like before, Pressure can be found by dividing the force applied by the area of the surface. Pressure is measured in N/m squared because of the dividing force in newtons and the area in
pressure1.gif
1.jpg
meters. However the SI unit for pressure is Pascal. So 1 N/m squared = 1 Pascal. So if the force is 1000 Newtons and the area is 500 meters, then the total pressure is 2 Pascals. There are also many ways to measure pressure with technology and devices. The barometer is an instrument that measures atmospheric pressure.






pressure







Works Cited:

Information:
Jones, T. Griffith. "Pressure." Motion, Forces, and Energy. Upper Saddle River: Pearson, 2009. Print.
Pressure." The International Encyclopedia of Science and Technology. New York: Oxford University Press Inc., 1999. Print.
"Pressure." UXL Encyclopedia of Science. 7. New York: 1998. Print.

Pictures:
1. "pressure‑solid.gif." School Champions. Web. 16 May 2011. <http://www.school-for-champions.com/science/pressure.htm>.
2. "underwater‑diving.jpg." Scuba Diving. Web. 16 May 2011. <http://www.happyscubadiving.tk/effects-of-underwater-pressure/>.
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5. "air_pressure.gif." Adapting to High Altitude. Web. 17 May 2011. <http://anthro.palomar.edu/adapt/adapt_3.htm>.
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"eel‑moray‑brown‑white‑spots‑plastic‑f146." Tv.gg. Web. 18 May 2011. <http://blogis.tv.gg/show_page/eel>.
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Websites:
"Scuba Diver." Toondoo. Web. 18 May 2011. <http://www.toondoo.com/>.
"Difference in Pressures." Xtranormal. Web. 18 May 2011. <http://www.xtranormal.com/>.
"Examples ." glogster. Web. 18 May 2011. <http://www.glogster.com/>.
"Welcome!." Voki. Web. 18 May 2011. <http://www.voki.com/>
.