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Monday February 25, 2013

Monday February 25, 2013. (Gas Pressure and Force). Bell Ringer Monday, 2-25-13. What causes this balloon to have the shape it has?. pressure. Announcements. Happy Peace Corps Week!. Announcements. I will be available after school today until 4:45. Pressure.

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Monday February 25, 2013

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  1. MondayFebruary 25, 2013 (Gas Pressure and Force)

  2. Bell RingerMonday, 2-25-13 What causes this balloon to have the shape it has? pressure

  3. Announcements Happy Peace Corps Week!

  4. Announcements I will be available after school today until 4:45.

  5. Pressure Suppose you have a one-gallon bottle with air in it. How much air do you actually have? The expression “a gallon of air” means little unless the conditions at which the volume is measured are known. A gallon of air can be compressed to a few milliliters, or it can also be allowed to expand to fill an entire room.

  6. Pressure To describe a gas fully, you need to state four measurable quantities: volume temperature number of molecules pressure

  7. Pressure and Force If you blow air into a rubber balloon, the balloon will increase in size - the volume increase is caused by the collisions of molecules of air with the inside walls of the balloon. The collisions cause an outward push, or force, against the inside walls. Pressure (P) is defined as the force per unit area on a surface. The equation defining pressure is: pressure = force/area

  8. Pressure and Force The unit for force is the newton (N). It is the force that will increase the speed of a one kilogram mass by one meter per second each second it is applied. At Earth’s surface, each kilogram of mass exerts 9.8 N of force, due to gravity.

  9. Pressure and Force Gas molecules exert pressure on any surface with which they collide. The pressure exerted by a gas depends on volume, temperature, and the number of molecules present. The atmosphere (the blanket of air surrounding Earth) exerts pressure. Atmospheric pressure at sea level is about equal to the weight of a 1.03 kg mass per square centimeter of surface, or 10.1 N/cm2.

  10. Pressure and Force The pressure of the atmosphere can be thought of as caused by the weight of the gases that compose the atmosphere. The atmosphere contains about 78% nitrogen, 21% oxygen, and 1% other gases, including argon and carbon dioxide. Atmospheric pressure is the sum of the individual pressures of the various gases in the atmosphere.

  11. Worksheet • Gas Pressure and Force

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